enable gocritic, unconvert and unused linters

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

.github/workflows/ci.yml

@@ -149,6 +149,8 @@ jobs:
       - name: Lint
         uses: golangci/golangci-lint-action@v3.4.0
         with:
+          args: --verbose
+          skip-cache: true
           version: v1.51.2
   fuzzing:
     uses: ./.github/workflows/fuzzing.yml

.golangci.yml

@@ -1,5 +1,5 @@
 run:
-  deadline: 5m
+  timeout: 15m
   skip-files:
     # Skip autogenerated files.
     - ^.*\.(pb|y)\.go$
@@ -10,14 +10,23 @@ output:
 linters:
   enable:
     - depguard
+    - gocritic
     - gofumpt
     - goimports
     - revive
     - misspell
+    - unconvert
+    - unused
 
 issues:
   max-same-issues: 0
   exclude-rules:
+    - linters:
+        - gocritic
+      text: "appendAssign"
+    - linters:
+        - gocritic
+      text: "singleCaseSwitch"
     - path: _test.go
       linters:
         - errcheck

cmd/prometheus/main.go

@@ -490,7 +490,7 @@ func main() {
 		if cfgFile.StorageConfig.ExemplarsConfig == nil {
 			cfgFile.StorageConfig.ExemplarsConfig = &config.DefaultExemplarsConfig
 		}
-		cfg.tsdb.MaxExemplars = int64(cfgFile.StorageConfig.ExemplarsConfig.MaxExemplars)
+		cfg.tsdb.MaxExemplars = cfgFile.StorageConfig.ExemplarsConfig.MaxExemplars
 	}
 	if cfgFile.StorageConfig.TSDBConfig != nil {
 		cfg.tsdb.OutOfOrderTimeWindow = cfgFile.StorageConfig.TSDBConfig.OutOfOrderTimeWindow

cmd/prometheus/query_log_test.go

@@ -193,7 +193,7 @@ func (p *queryLogTest) String() string {
 	}
 	name = name + ", " + p.host + ":" + strconv.Itoa(p.port)
 	if p.enabledAtStart {
-		name = name + ", enabled at start"
+		name += ", enabled at start"
 	}
 	if p.prefix != "" {
 		name = name + ", with prefix " + p.prefix

cmd/promtool/backfill.go

@@ -101,7 +101,7 @@ func createBlocks(input []byte, mint, maxt, maxBlockDuration int64, maxSamplesIn
 		nextSampleTs int64 = math.MaxInt64
 	)
 
-	for t := mint; t <= maxt; t = t + blockDuration {
+	for t := mint; t <= maxt; t += blockDuration {
 		tsUpper := t + blockDuration
 		if nextSampleTs != math.MaxInt64 && nextSampleTs >= tsUpper {
 			// The next sample is not in this timerange, we can avoid parsing

cmd/promtool/rules.go

@@ -100,7 +100,7 @@ func (importer *ruleImporter) importRule(ctx context.Context, ruleExpr, ruleName
 	startInMs := start.Unix() * int64(time.Second/time.Millisecond)
 	endInMs := end.Unix() * int64(time.Second/time.Millisecond)
 
-	for startOfBlock := blockDuration * (startInMs / blockDuration); startOfBlock <= endInMs; startOfBlock = startOfBlock + blockDuration {
+	for startOfBlock := blockDuration * (startInMs / blockDuration); startOfBlock <= endInMs; startOfBlock += blockDuration {
 		endOfBlock := startOfBlock + blockDuration - 1
 
 		currStart := max(startOfBlock/int64(time.Second/time.Millisecond), start.Unix())

cmd/promtool/unittest.go

@@ -130,7 +130,7 @@ func resolveAndGlobFilepaths(baseDir string, utf *unitTestFile) error {
 		if err != nil {
 			return err
 		}
-		if len(m) <= 0 {
+		if len(m) == 0 {
 			fmt.Fprintln(os.Stderr, "  WARNING: no file match pattern", rf)
 		}
 		globbedFiles = append(globbedFiles, m...)

discovery/kubernetes/endpointslice.go

@@ -300,7 +300,7 @@ func (e *EndpointSlice) buildEndpointSlice(eps endpointSliceAdaptor) *targetgrou
 		}
 
 		if port.protocol() != nil {
-			target[endpointSlicePortProtocolLabel] = lv(string(*port.protocol()))
+			target[endpointSlicePortProtocolLabel] = lv(*port.protocol())
 		}
 
 		if port.port() != nil {

discovery/kubernetes/kubernetes.go

@@ -299,12 +299,13 @@ func New(l log.Logger, conf *SDConfig) (*Discovery, error) {
 		err          error
 		ownNamespace string
 	)
-	if conf.KubeConfig != "" {
+	switch {
+	case conf.KubeConfig != "":
 		kcfg, err = clientcmd.BuildConfigFromFlags("", conf.KubeConfig)
 		if err != nil {
 			return nil, err
 		}
-	} else if conf.APIServer.URL == nil {
+	case conf.APIServer.URL == nil:
 		// Use the Kubernetes provided pod service account
 		// as described in https://kubernetes.io/docs/admin/service-accounts-admin/
 		kcfg, err = rest.InClusterConfig()
@@ -324,7 +325,7 @@ func New(l log.Logger, conf *SDConfig) (*Discovery, error) {
 		}
 
 		level.Info(l).Log("msg", "Using pod service account via in-cluster config")
-	} else {
+	default:
 		rt, err := config.NewRoundTripperFromConfig(conf.HTTPClientConfig, "kubernetes_sd")
 		if err != nil {
 			return nil, err

discovery/legacymanager/registry.go

@@ -254,7 +254,7 @@ func replaceYAMLTypeError(err error, oldTyp, newTyp reflect.Type) error {
 		oldStr := oldTyp.String()
 		newStr := newTyp.String()
 		for i, s := range e.Errors {
-			e.Errors[i] = strings.Replace(s, oldStr, newStr, -1)
+			e.Errors[i] = strings.ReplaceAll(s, oldStr, newStr)
 		}
 	}
 	return err

discovery/linode/linode.go

@@ -249,20 +249,20 @@ func (d *Discovery) refreshData(ctx context.Context) ([]*targetgroup.Group, erro
 				if detailedIP.Address != ip.String() {
 					continue
 				}
-
+				switch {
-				if detailedIP.Public && publicIPv4 == "" {
+				case detailedIP.Public && publicIPv4 == "":
 					publicIPv4 = detailedIP.Address
 
 					if detailedIP.RDNS != "" && detailedIP.RDNS != "null" {
 						publicIPv4RDNS = detailedIP.RDNS
 					}
-				} else if !detailedIP.Public && privateIPv4 == "" {
+				case !detailedIP.Public && privateIPv4 == "":
 					privateIPv4 = detailedIP.Address
 
 					if detailedIP.RDNS != "" && detailedIP.RDNS != "null" {
 						privateIPv4RDNS = detailedIP.RDNS
 					}
-				} else {
+				default:
 					extraIPs = append(extraIPs, detailedIP.Address)
 				}
 			}

discovery/marathon/marathon.go

@@ -400,19 +400,20 @@ func targetsForApp(app *app) []model.LabelSet {
 	var labels []map[string]string
 	var prefix string
 
-	if len(app.Container.PortMappings) != 0 {
+	switch {
+	case len(app.Container.PortMappings) != 0:
 		// In Marathon 1.5.x the "container.docker.portMappings" object was moved
 		// to "container.portMappings".
 		ports, labels = extractPortMapping(app.Container.PortMappings, app.isContainerNet())
 		prefix = portMappingLabelPrefix
 
-	} else if len(app.Container.Docker.PortMappings) != 0 {
+	case len(app.Container.Docker.PortMappings) != 0:
 		// Prior to Marathon 1.5 the port mappings could be found at the path
 		// "container.docker.portMappings".
 		ports, labels = extractPortMapping(app.Container.Docker.PortMappings, app.isContainerNet())
 		prefix = portMappingLabelPrefix
 
-	} else if len(app.PortDefinitions) != 0 {
+	case len(app.PortDefinitions) != 0:
 		// PortDefinitions deprecates the "ports" array and can be used to specify
 		// a list of ports with metadata in case a mapping is not required.
 		ports = make([]uint32, len(app.PortDefinitions))

discovery/ovhcloud/dedicated_server_test.go

@@ -84,7 +84,7 @@ func MockDedicatedAPI(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	w.Header().Set("Content-Type", "application/json")
-	if string(r.URL.Path) == "/dedicated/server" {
+	if r.URL.Path == "/dedicated/server" {
 		dedicatedServersList, err := os.ReadFile("testdata/dedicated_server/dedicated_servers.json")
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
@@ -96,7 +96,7 @@ func MockDedicatedAPI(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	}
-	if string(r.URL.Path) == "/dedicated/server/abcde" {
+	if r.URL.Path == "/dedicated/server/abcde" {
 		dedicatedServer, err := os.ReadFile("testdata/dedicated_server/dedicated_servers_details.json")
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
@@ -108,7 +108,7 @@ func MockDedicatedAPI(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	}
-	if string(r.URL.Path) == "/dedicated/server/abcde/ips" {
+	if r.URL.Path == "/dedicated/server/abcde/ips" {
 		dedicatedServerIPs, err := os.ReadFile("testdata/dedicated_server/dedicated_servers_abcde_ips.json")
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)

discovery/ovhcloud/vps_test.go

@@ -91,7 +91,7 @@ func MockVpsAPI(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	w.Header().Set("Content-Type", "application/json")
-	if string(r.URL.Path) == "/vps" {
+	if r.URL.Path == "/vps" {
 		dedicatedServersList, err := os.ReadFile("testdata/vps/vps.json")
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
@@ -103,7 +103,7 @@ func MockVpsAPI(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	}
-	if string(r.URL.Path) == "/vps/abc" {
+	if r.URL.Path == "/vps/abc" {
 		dedicatedServer, err := os.ReadFile("testdata/vps/vps_details.json")
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
@@ -115,7 +115,7 @@ func MockVpsAPI(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	}
-	if string(r.URL.Path) == "/vps/abc/ips" {
+	if r.URL.Path == "/vps/abc/ips" {
 		dedicatedServerIPs, err := os.ReadFile("testdata/vps/vps_abc_ips.json")
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)

discovery/registry.go

@@ -253,7 +253,7 @@ func replaceYAMLTypeError(err error, oldTyp, newTyp reflect.Type) error {
 		oldStr := oldTyp.String()
 		newStr := newTyp.String()
 		for i, s := range e.Errors {
-			e.Errors[i] = strings.Replace(s, oldStr, newStr, -1)
+			e.Errors[i] = strings.ReplaceAll(s, oldStr, newStr)
 		}
 	}
 	return err

discovery/vultr/vultr.go

@@ -202,10 +202,8 @@ func (d *Discovery) listInstances(ctx context.Context) ([]govultr.Instance, erro
 
 		if meta.Links.Next == "" {
 			break
-		} else {
-			listOptions.Cursor = meta.Links.Next
-			continue
 		}
+		listOptions.Cursor = meta.Links.Next
 	}
 
 	return instances, nil

documentation/examples/remote_storage/remote_storage_adapter/influxdb/client.go

@@ -184,11 +184,11 @@ func (c *Client) buildCommand(q *prompb.Query) (string, error) {
 }
 
 func escapeSingleQuotes(str string) string {
-	return strings.Replace(str, `'`, `\'`, -1)
+	return strings.ReplaceAll(str, `'`, `\'`)
 }
 
 func escapeSlashes(str string) string {
-	return strings.Replace(str, `/`, `\/`, -1)
+	return strings.ReplaceAll(str, `/`, `\/`)
 }
 
 func mergeResult(labelsToSeries map[string]*prompb.TimeSeries, results []influx.Result) error {
@@ -290,13 +290,14 @@ func mergeSamples(a, b []prompb.Sample) []prompb.Sample {
 	result := make([]prompb.Sample, 0, len(a)+len(b))
 	i, j := 0, 0
 	for i < len(a) && j < len(b) {
-		if a[i].Timestamp < b[j].Timestamp {
+		switch {
+		case a[i].Timestamp < b[j].Timestamp:
 			result = append(result, a[i])
 			i++
-		} else if a[i].Timestamp > b[j].Timestamp {
+		case a[i].Timestamp > b[j].Timestamp:
 			result = append(result, b[j])
 			j++
-		} else {
+		default:
 			result = append(result, a[i])
 			i++
 			j++

model/labels/labels.go

@@ -169,11 +169,12 @@ func (ls Labels) HashForLabels(b []byte, names ...string) (uint64, []byte) {
 	b = b[:0]
 	i, j := 0, 0
 	for i < len(ls) && j < len(names) {
-		if names[j] < ls[i].Name {
+		switch {
+		case names[j] < ls[i].Name:
 			j++
-		} else if ls[i].Name < names[j] {
+		case ls[i].Name < names[j]:
 			i++
-		} else {
+		default:
 			b = append(b, ls[i].Name...)
 			b = append(b, seps[0])
 			b = append(b, ls[i].Value...)
@@ -213,11 +214,12 @@ func (ls Labels) BytesWithLabels(buf []byte, names ...string) []byte {
 	b.WriteByte(labelSep)
 	i, j := 0, 0
 	for i < len(ls) && j < len(names) {
-		if names[j] < ls[i].Name {
+		switch {
+		case names[j] < ls[i].Name:
 			j++
-		} else if ls[i].Name < names[j] {
+		case ls[i].Name < names[j]:
 			i++
-		} else {
+		default:
 			if b.Len() > 1 {
 				b.WriteByte(seps[0])
 			}

model/textparse/promparse_test.go

@@ -512,7 +512,7 @@ func BenchmarkGzip(b *testing.B) {
 			k := b.N / promtestdataSampleCount
 
 			b.ReportAllocs()
-			b.SetBytes(int64(n) / promtestdataSampleCount)
+			b.SetBytes(n / promtestdataSampleCount)
 			b.ResetTimer()
 
 			total := 0

promql/bench_test.go

@@ -194,9 +194,9 @@ func rangeQueryCases() []benchCase {
 		if !strings.Contains(c.expr, "X") {
 			tmp = append(tmp, c)
 		} else {
-			tmp = append(tmp, benchCase{expr: strings.Replace(c.expr, "X", "one", -1), steps: c.steps})
+			tmp = append(tmp, benchCase{expr: strings.ReplaceAll(c.expr, "X", "one"), steps: c.steps})
-			tmp = append(tmp, benchCase{expr: strings.Replace(c.expr, "X", "ten", -1), steps: c.steps})
+			tmp = append(tmp, benchCase{expr: strings.ReplaceAll(c.expr, "X", "ten"), steps: c.steps})
-			tmp = append(tmp, benchCase{expr: strings.Replace(c.expr, "X", "hundred", -1), steps: c.steps})
+			tmp = append(tmp, benchCase{expr: strings.ReplaceAll(c.expr, "X", "hundred"), steps: c.steps})
 		}
 	}
 	cases = tmp

promql/engine.go

@@ -783,7 +783,6 @@ func (ng *Engine) findMinMaxTime(s *parser.EvalStmt) (int64, int64) {
 				maxTimestamp = end
 			}
 			evalRange = 0
-
 		case *parser.MatrixSelector:
 			evalRange = n.Range
 		}
@@ -816,20 +815,20 @@ func (ng *Engine) getTimeRangesForSelector(s *parser.EvalStmt, n *parser.VectorS
 	} else {
 		offsetMilliseconds := durationMilliseconds(subqOffset)
 		start = start - offsetMilliseconds - durationMilliseconds(subqRange)
-		end = end - offsetMilliseconds
+		end -= offsetMilliseconds
 	}
 
 	if evalRange == 0 {
-		start = start - durationMilliseconds(s.LookbackDelta)
+		start -= durationMilliseconds(s.LookbackDelta)
 	} else {
 		// For all matrix queries we want to ensure that we have (end-start) + range selected
 		// this way we have `range` data before the start time
-		start = start - durationMilliseconds(evalRange)
+		start -= durationMilliseconds(evalRange)
 	}
 
 	offsetMilliseconds := durationMilliseconds(n.OriginalOffset)
-	start = start - offsetMilliseconds
+	start -= offsetMilliseconds
-	end = end - offsetMilliseconds
+	end -= offsetMilliseconds
 
 	return start, end
 }
@@ -1745,7 +1744,7 @@ func (ev *evaluator) eval(expr parser.Expr) (parser.Value, storage.Warnings) {
 		res, ws := newEv.eval(e.Expr)
 		ev.currentSamples = newEv.currentSamples
 		ev.samplesStats.UpdatePeakFromSubquery(newEv.samplesStats)
-		for ts, step := ev.startTimestamp, -1; ts <= ev.endTimestamp; ts = ts + ev.interval {
+		for ts, step := ev.startTimestamp, -1; ts <= ev.endTimestamp; ts += ev.interval {
 			step++
 			ev.samplesStats.IncrementSamplesAtStep(step, newEv.samplesStats.TotalSamples)
 		}
@@ -1767,7 +1766,7 @@ func (ev *evaluator) eval(expr parser.Expr) (parser.Value, storage.Warnings) {
 			if len(mat[i].Floats)+len(mat[i].Histograms) != 1 {
 				panic(fmt.Errorf("unexpected number of samples"))
 			}
-			for ts := ev.startTimestamp + ev.interval; ts <= ev.endTimestamp; ts = ts + ev.interval {
+			for ts := ev.startTimestamp + ev.interval; ts <= ev.endTimestamp; ts += ev.interval {
 				if len(mat[i].Floats) > 0 {
 					mat[i].Floats = append(mat[i].Floats, FPoint{
 						T: ts,
@@ -2514,14 +2513,15 @@ func (ev *evaluator) aggregation(op parser.ItemType, grouping []string, without
 		if !ok {
 			var m labels.Labels
 			enh.resetBuilder(metric)
-			if without {
+			switch {
+			case without:
 				enh.lb.Del(grouping...)
 				enh.lb.Del(labels.MetricName)
 				m = enh.lb.Labels()
-			} else if len(grouping) > 0 {
+			case len(grouping) > 0:
 				enh.lb.Keep(grouping...)
 				m = enh.lb.Labels()
-			} else {
+			default:
 				m = labels.EmptyLabels()
 			}
 			newAgg := &groupedAggregation{
@@ -2689,7 +2689,7 @@ func (ev *evaluator) aggregation(op parser.ItemType, grouping []string, without
 			aggr.floatValue = float64(aggr.groupCount)
 
 		case parser.STDVAR:
-			aggr.floatValue = aggr.floatValue / float64(aggr.groupCount)
+			aggr.floatValue /= float64(aggr.groupCount)
 
 		case parser.STDDEV:
 			aggr.floatValue = math.Sqrt(aggr.floatValue / float64(aggr.groupCount))

promql/engine_test.go

@@ -3267,7 +3267,7 @@ func TestNativeHistogram_HistogramCountAndSum(t *testing.T) {
 			require.Len(t, vector, 1)
 			require.Nil(t, vector[0].H)
 			if floatHisto {
-				require.Equal(t, float64(h.ToFloat().Count), vector[0].F)
+				require.Equal(t, h.ToFloat().Count, vector[0].F)
 			} else {
 				require.Equal(t, float64(h.Count), vector[0].F)
 			}

promql/functions.go

@@ -877,10 +877,10 @@ func linearRegression(samples []FPoint, interceptTime int64) (slope, intercept f
 		}
 		return 0, initY
 	}
-	sumX = sumX + cX
+	sumX += cX
-	sumY = sumY + cY
+	sumY += cY
-	sumXY = sumXY + cXY
+	sumXY += cXY
-	sumX2 = sumX2 + cX2
+	sumX2 += cX2
 
 	covXY := sumXY - sumX*sumY/n
 	varX := sumX2 - sumX*sumX/n

promql/functions_test.go

@@ -51,7 +51,7 @@ func TestDeriv(t *testing.T) {
 	// https://github.com/prometheus/prometheus/issues/7180
 	for i = 0; i < 15; i++ {
 		jitter := 12 * i % 2
-		a.Append(0, metric, int64(start+interval*i+jitter), 1)
+		a.Append(0, metric, start+interval*i+jitter, 1)
 	}
 
 	require.NoError(t, a.Commit())

promql/parser/ast.go

@@ -349,7 +349,7 @@ func (f inspector) Visit(node Node, path []Node) (Visitor, error) {
 // for all the non-nil children of node, recursively.
 func Inspect(node Node, f inspector) {
 	//nolint: errcheck
-	Walk(inspector(f), node, nil)
+	Walk(f, node, nil)
 }
 
 // Children returns a list of all child nodes of a syntax tree node.
@@ -368,13 +368,14 @@ func Children(node Node) []Node {
 	case *AggregateExpr:
 		// While this does not look nice, it should avoid unnecessary allocations
 		// caused by slice resizing
-		if n.Expr == nil && n.Param == nil {
+		switch {
+		case n.Expr == nil && n.Param == nil:
 			return nil
-		} else if n.Expr == nil {
+		case n.Expr == nil:
 			return []Node{n.Param}
-		} else if n.Param == nil {
+		case n.Param == nil:
 			return []Node{n.Expr}
-		} else {
+		default:
 			return []Node{n.Expr, n.Param}
 		}
 	case *BinaryExpr:

promql/parser/parse.go

@@ -523,9 +523,8 @@ func (p *parser) checkAST(node Node) (typ ValueType) {
 				p.addParseErrf(n.PositionRange(), "vector matching only allowed between instant vectors")
 			}
 			n.VectorMatching = nil
-		} else {
 			// Both operands are Vectors.
-			if n.Op.IsSetOperator() {
+		} else if n.Op.IsSetOperator() {
 			if n.VectorMatching.Card == CardOneToMany || n.VectorMatching.Card == CardManyToOne {
 				p.addParseErrf(n.PositionRange(), "no grouping allowed for %q operation", n.Op)
 			}
@@ -533,7 +532,6 @@ func (p *parser) checkAST(node Node) (typ ValueType) {
 				p.addParseErrf(n.PositionRange(), "set operations must always be many-to-many")
 			}
 		}
-		}
 
 		if (lt == ValueTypeScalar || rt == ValueTypeScalar) && n.Op.IsSetOperator() {
 			p.addParseErrf(n.PositionRange(), "set operator %q not allowed in binary scalar expression", n.Op)

promql/parser/parse_test.go

@@ -3592,7 +3592,7 @@ func TestNaNExpression(t *testing.T) {
 
 	nl, ok := expr.(*NumberLiteral)
 	require.True(t, ok, "expected number literal but got %T", expr)
-	require.True(t, math.IsNaN(float64(nl.Val)), "expected 'NaN' in number literal but got %v", nl.Val)
+	require.True(t, math.IsNaN(nl.Val), "expected 'NaN' in number literal but got %v", nl.Val)
 }
 
 var testSeries = []struct {

promql/parser/printer.go

@@ -130,11 +130,12 @@ func (node *MatrixSelector) String() string {
 		offset = fmt.Sprintf(" offset -%s", model.Duration(-vecSelector.OriginalOffset))
 	}
 	at := ""
-	if vecSelector.Timestamp != nil {
+	switch {
+	case vecSelector.Timestamp != nil:
 		at = fmt.Sprintf(" @ %.3f", float64(*vecSelector.Timestamp)/1000.0)
-	} else if vecSelector.StartOrEnd == START {
+	case vecSelector.StartOrEnd == START:
 		at = " @ start()"
-	} else if vecSelector.StartOrEnd == END {
+	case vecSelector.StartOrEnd == END:
 		at = " @ end()"
 	}
 
@@ -168,11 +169,12 @@ func (node *SubqueryExpr) getSubqueryTimeSuffix() string {
 		offset = fmt.Sprintf(" offset -%s", model.Duration(-node.OriginalOffset))
 	}
 	at := ""
-	if node.Timestamp != nil {
+	switch {
+	case node.Timestamp != nil:
 		at = fmt.Sprintf(" @ %.3f", float64(*node.Timestamp)/1000.0)
-	} else if node.StartOrEnd == START {
+	case node.StartOrEnd == START:
 		at = " @ start()"
-	} else if node.StartOrEnd == END {
+	case node.StartOrEnd == END:
 		at = " @ end()"
 	}
 	return fmt.Sprintf("[%s:%s]%s%s", model.Duration(node.Range), step, at, offset)
@@ -213,11 +215,12 @@ func (node *VectorSelector) String() string {
 		offset = fmt.Sprintf(" offset -%s", model.Duration(-node.OriginalOffset))
 	}
 	at := ""
-	if node.Timestamp != nil {
+	switch {
+	case node.Timestamp != nil:
 		at = fmt.Sprintf(" @ %.3f", float64(*node.Timestamp)/1000.0)
-	} else if node.StartOrEnd == START {
+	case node.StartOrEnd == START:
 		at = " @ start()"
-	} else if node.StartOrEnd == END {
+	case node.StartOrEnd == END:
 		at = " @ end()"
 	}
 

rules/manager.go

@@ -866,12 +866,13 @@ func (g *Group) RestoreForState(ts time.Time) {
 			timeSpentPending := downAt.Sub(restoredActiveAt)
 			timeRemainingPending := alertHoldDuration - timeSpentPending
 
-			if timeRemainingPending <= 0 {
+			switch {
+			case timeRemainingPending <= 0:
 				// It means that alert was firing when prometheus went down.
 				// In the next Eval, the state of this alert will be set back to
 				// firing again if it's still firing in that Eval.
 				// Nothing to be done in this case.
-			} else if timeRemainingPending < g.opts.ForGracePeriod {
+			case timeRemainingPending < g.opts.ForGracePeriod:
 				// (new) restoredActiveAt = (ts + m.opts.ForGracePeriod) - alertHoldDuration
 				//                            /* new firing time */      /* moving back by hold duration */
 				//
@@ -884,7 +885,7 @@ func (g *Group) RestoreForState(ts time.Time) {
 				//                        = (ts + m.opts.ForGracePeriod) - ts
 				//                        = m.opts.ForGracePeriod
 				restoredActiveAt = ts.Add(g.opts.ForGracePeriod).Add(-alertHoldDuration)
-			} else {
+			default:
 				// By shifting ActiveAt to the future (ActiveAt + some_duration),
 				// the total pending time from the original ActiveAt
 				// would be `alertHoldDuration + some_duration`.

rules/manager_test.go

@@ -481,17 +481,18 @@ func TestForStateRestore(t *testing.T) {
 		})
 
 		// Checking if we have restored it correctly.
-		if tst.noRestore {
+		switch {
+		case tst.noRestore:
 			require.Equal(t, tst.num, len(got))
 			for _, e := range got {
 				require.Equal(t, e.ActiveAt, restoreTime)
 			}
-		} else if tst.gracePeriod {
+		case tst.gracePeriod:
 			require.Equal(t, tst.num, len(got))
 			for _, e := range got {
 				require.Equal(t, opts.ForGracePeriod, e.ActiveAt.Add(alertForDuration).Sub(restoreTime))
 			}
-		} else {
+		default:
 			exp := tst.alerts
 			require.Equal(t, len(exp), len(got))
 			sortAlerts(exp)

scrape/scrape.go

@@ -640,7 +640,7 @@ func verifyLabelLimits(lset labels.Labels, limits *labelLimits) error {
 	met := lset.Get(labels.MetricName)
 	if limits.labelLimit > 0 {
 		nbLabels := lset.Len()
-		if nbLabels > int(limits.labelLimit) {
+		if nbLabels > limits.labelLimit {
 			return fmt.Errorf("label_limit exceeded (metric: %.50s, number of labels: %d, limit: %d)", met, nbLabels, limits.labelLimit)
 		}
 	}
@@ -652,14 +652,14 @@ func verifyLabelLimits(lset labels.Labels, limits *labelLimits) error {
 	return lset.Validate(func(l labels.Label) error {
 		if limits.labelNameLengthLimit > 0 {
 			nameLength := len(l.Name)
-			if nameLength > int(limits.labelNameLengthLimit) {
+			if nameLength > limits.labelNameLengthLimit {
 				return fmt.Errorf("label_name_length_limit exceeded (metric: %.50s, label name: %.50s, length: %d, limit: %d)", met, l.Name, nameLength, limits.labelNameLengthLimit)
 			}
 		}
 
 		if limits.labelValueLengthLimit > 0 {
 			valueLength := len(l.Value)
-			if valueLength > int(limits.labelValueLengthLimit) {
+			if valueLength > limits.labelValueLengthLimit {
 				return fmt.Errorf("label_value_length_limit exceeded (metric: %.50s, label name: %.50s, value: %.50q, length: %d, limit: %d)", met, l.Name, l.Value, valueLength, limits.labelValueLengthLimit)
 			}
 		}

scrape/scrape_test.go

@@ -322,7 +322,7 @@ func TestScrapePoolReloadPreserveRelabeledIntervalTimeout(t *testing.T) {
 		ScrapeTimeout:  model.Duration(2 * time.Second),
 	}
 	newLoop := func(opts scrapeLoopOptions) loop {
-		l := &testLoop{interval: time.Duration(opts.interval), timeout: time.Duration(opts.timeout)}
+		l := &testLoop{interval: opts.interval, timeout: opts.timeout}
 		l.startFunc = func(interval, timeout time.Duration, errc chan<- error) {
 			require.Equal(t, 5*time.Second, interval, "Unexpected scrape interval")
 			require.Equal(t, 3*time.Second, timeout, "Unexpected scrape timeout")
@@ -546,7 +546,7 @@ func TestScrapePoolRaces(t *testing.T) {
 	require.Equal(t, expectedDropped, len(dropped), "Invalid number of dropped targets")
 
 	for i := 0; i < 20; i++ {
-		time.Sleep(time.Duration(10 * time.Millisecond))
+		time.Sleep(10 * time.Millisecond)
 		sp.reload(newConfig())
 	}
 	sp.stop()
@@ -1199,14 +1199,14 @@ func TestScrapeLoopRunCreatesStaleMarkersOnParseFailure(t *testing.T) {
 	// Succeed once, several failures, then stop.
 	scraper.scrapeFunc = func(ctx context.Context, w io.Writer) error {
 		numScrapes++
-
+		switch {
-		if numScrapes == 1 {
+		case numScrapes == 1:
 			w.Write([]byte("metric_a 42\n"))
 			return nil
-		} else if numScrapes == 2 {
+		case numScrapes == 2:
 			w.Write([]byte("7&-\n"))
 			return nil
-		} else if numScrapes == 3 {
+		case numScrapes == 3:
 			cancel()
 		}
 		return errors.New("scrape failed")
@@ -1282,14 +1282,14 @@ func TestScrapeLoopCache(t *testing.T) {
 		}
 
 		numScrapes++
-
+		switch {
-		if numScrapes == 1 {
+		case numScrapes == 1:
 			w.Write([]byte("metric_a 42\nmetric_b 43\n"))
 			return nil
-		} else if numScrapes == 3 {
+		case numScrapes == 3:
 			w.Write([]byte("metric_a 44\n"))
 			return nil
-		} else if numScrapes == 4 {
+		case numScrapes == 4:
 			cancel()
 		}
 		return fmt.Errorf("scrape failed")
@@ -2280,11 +2280,12 @@ func TestTargetScrapeScrapeCancel(t *testing.T) {
 
 	go func() {
 		_, err := ts.scrape(ctx, io.Discard)
-		if err == nil {
+		switch {
+		case err == nil:
 			errc <- errors.New("Expected error but got nil")
-		} else if ctx.Err() != context.Canceled {
+		case ctx.Err() != context.Canceled:
 			errc <- errors.Errorf("Expected context cancellation error but got: %s", ctx.Err())
-		} else {
+		default:
 			close(errc)
 		}
 	}()

scrape/target.go

@@ -413,9 +413,9 @@ func PopulateLabels(lb *labels.Builder, cfg *config.ScrapeConfig, noDefaultPort
 		// Addresses reaching this point are already wrapped in [] if necessary.
 		switch scheme {
 		case "http", "":
-			addr = addr + ":80"
+			addr += ":80"
 		case "https":
-			addr = addr + ":443"
+			addr += ":443"
 		default:
 			return labels.EmptyLabels(), labels.EmptyLabels(), errors.Errorf("invalid scheme: %q", cfg.Scheme)
 		}

storage/merge.go

@@ -197,13 +197,14 @@ func mergeStrings(a, b []string) []string {
 	res := make([]string, 0, maxl*10/9)
 
 	for len(a) > 0 && len(b) > 0 {
-		if a[0] == b[0] {
+		switch {
+		case a[0] == b[0]:
 			res = append(res, a[0])
 			a, b = a[1:], b[1:]
-		} else if a[0] < b[0] {
+		case a[0] < b[0]:
 			res = append(res, a[0])
 			a = a[1:]
-		} else {
+		default:
 			res = append(res, b[0])
 			b = b[1:]
 		}

storage/remote/codec.go

@@ -291,13 +291,14 @@ func MergeLabels(primary, secondary []prompb.Label) []prompb.Label {
 	result := make([]prompb.Label, 0, len(primary)+len(secondary))
 	i, j := 0, 0
 	for i < len(primary) && j < len(secondary) {
-		if primary[i].Name < secondary[j].Name {
+		switch {
+		case primary[i].Name < secondary[j].Name:
 			result = append(result, primary[i])
 			i++
-		} else if primary[i].Name > secondary[j].Name {
+		case primary[i].Name > secondary[j].Name:
 			result = append(result, secondary[j])
 			j++
-		} else {
+		default:
 			result = append(result, primary[i])
 			i++
 			j++
@@ -428,8 +429,8 @@ func (c *concreteSeriesIterator) Seek(t int64) chunkenc.ValueType {
 	c.histogramsCur += sort.Search(len(c.series.histograms)-c.histogramsCur, func(n int) bool {
 		return c.series.histograms[n+c.histogramsCur].Timestamp >= t
 	})
-
+	switch {
-	if c.floatsCur < len(c.series.floats) && c.histogramsCur < len(c.series.histograms) {
+	case c.floatsCur < len(c.series.floats) && c.histogramsCur < len(c.series.histograms):
 		// If float samples and histogram samples have overlapping timestamps prefer the float samples.
 		if c.series.floats[c.floatsCur].Timestamp <= c.series.histograms[c.histogramsCur].Timestamp {
 			c.curValType = chunkenc.ValFloat
@@ -445,12 +446,11 @@ func (c *concreteSeriesIterator) Seek(t int64) chunkenc.ValueType {
 				c.floatsCur--
 			}
 		}
-	} else if c.floatsCur < len(c.series.floats) {
+	case c.floatsCur < len(c.series.floats):
 		c.curValType = chunkenc.ValFloat
-	} else if c.histogramsCur < len(c.series.histograms) {
+	case c.histogramsCur < len(c.series.histograms):
 		c.curValType = getHistogramValType(&c.series.histograms[c.histogramsCur])
 	}
-
 	return c.curValType
 }
 
@@ -514,26 +514,25 @@ func (c *concreteSeriesIterator) Next() chunkenc.ValueType {
 		peekHistTS = c.series.histograms[c.histogramsCur+1].Timestamp
 	}
 	c.curValType = chunkenc.ValNone
-
+	switch {
-	if peekFloatTS < peekHistTS {
+	case peekFloatTS < peekHistTS:
 		c.floatsCur++
 		c.curValType = chunkenc.ValFloat
-	} else if peekHistTS < peekFloatTS {
+	case peekHistTS < peekFloatTS:
 		c.histogramsCur++
 		c.curValType = chunkenc.ValHistogram
-	} else if peekFloatTS == noTS && peekHistTS == noTS {
+	case peekFloatTS == noTS && peekHistTS == noTS:
 		// This only happens when the iterator is exhausted; we set the cursors off the end to prevent
 		// Seek() from returning anything afterwards.
 		c.floatsCur = len(c.series.floats)
 		c.histogramsCur = len(c.series.histograms)
-	} else {
+	default:
 		// Prefer float samples to histogram samples if there's a conflict. We advance the cursor for histograms
 		// anyway otherwise the histogram sample will get selected on the next call to Next().
 		c.floatsCur++
 		c.histogramsCur++
 		c.curValType = chunkenc.ValFloat
 	}
-
 	return c.curValType
 }
 

storage/remote/queue_manager.go

@@ -609,7 +609,7 @@ outer:
 
 			t.metrics.enqueueRetriesTotal.Inc()
 			time.Sleep(time.Duration(backoff))
-			backoff = backoff * 2
+			backoff *= 2
 			// It is reasonable to use t.cfg.MaxBackoff here, as if we have hit
 			// the full backoff we are likely waiting for external resources.
 			if backoff > t.cfg.MaxBackoff {
@@ -660,7 +660,7 @@ outer:
 
 			t.metrics.enqueueRetriesTotal.Inc()
 			time.Sleep(time.Duration(backoff))
-			backoff = backoff * 2
+			backoff *= 2
 			if backoff > t.cfg.MaxBackoff {
 				backoff = t.cfg.MaxBackoff
 			}
@@ -707,7 +707,7 @@ outer:
 
 			t.metrics.enqueueRetriesTotal.Inc()
 			time.Sleep(time.Duration(backoff))
-			backoff = backoff * 2
+			backoff *= 2
 			if backoff > t.cfg.MaxBackoff {
 				backoff = t.cfg.MaxBackoff
 			}
@@ -754,7 +754,7 @@ outer:
 
 			t.metrics.enqueueRetriesTotal.Inc()
 			time.Sleep(time.Duration(backoff))
-			backoff = backoff * 2
+			backoff *= 2
 			if backoff > t.cfg.MaxBackoff {
 				backoff = t.cfg.MaxBackoff
 			}

template/template.go

@@ -421,7 +421,7 @@ func (te Expander) ExpandHTML(templateFiles []string) (result string, resultErr
 			}
 		}
 	}()
-
+	//nolint:unconvert // Before Go 1.19 conversion from text_template to html_template is mandatory
 	tmpl := html_template.New(te.name).Funcs(html_template.FuncMap(te.funcMap))
 	tmpl.Option(te.options...)
 	tmpl.Funcs(html_template.FuncMap{

tsdb/agent/db_test.go

@@ -739,8 +739,7 @@ func TestStorage_DuplicateExemplarsIgnored(t *testing.T) {
 	var dec record.Decoder
 	for r.Next() {
 		rec := r.Record()
-		switch dec.Type(rec) {
+		if dec.Type(rec) == record.Exemplars {
-		case record.Exemplars:
 			var exemplars []record.RefExemplar
 			exemplars, err = dec.Exemplars(rec, exemplars)
 			require.NoError(t, err)

tsdb/block_test.go

@@ -630,7 +630,7 @@ func genHistogramSeries(totalSeries, labelCount int, mint, maxt, step int64, flo
 				{Offset: 0, Length: 2},
 				{Offset: 1, Length: 2},
 			},
-			PositiveBuckets: []int64{int64(ts + 1), 1, -1, 0},
+			PositiveBuckets: []int64{ts + 1, 1, -1, 0},
 		}
 		if ts != mint {
 			// By setting the counter reset hint to "no counter
@@ -669,7 +669,7 @@ func genHistogramAndFloatSeries(totalSeries, labelCount int, mint, maxt, step in
 					{Offset: 0, Length: 2},
 					{Offset: 1, Length: 2},
 				},
-				PositiveBuckets: []int64{int64(ts + 1), 1, -1, 0},
+				PositiveBuckets: []int64{ts + 1, 1, -1, 0},
 			}
 			if count > 1 && count%5 != 1 {
 				// Same rationale for this as above in

tsdb/chunkenc/bstream.go

@@ -182,7 +182,7 @@ func (b *bstreamReader) readBits(nbits uint8) (uint64, error) {
 	}
 
 	bitmask = (uint64(1) << nbits) - 1
-	v = v | ((b.buffer >> (b.valid - nbits)) & bitmask)
+	v |= ((b.buffer >> (b.valid - nbits)) & bitmask)
 	b.valid -= nbits
 
 	return v, nil
@@ -242,13 +242,13 @@ func (b *bstreamReader) loadNextBuffer(nbits uint8) bool {
 	if b.streamOffset+nbytes == len(b.stream) {
 		// There can be concurrent writes happening on the very last byte
 		// of the stream, so use the copy we took at initialization time.
-		buffer = buffer | uint64(b.last)
+		buffer |= uint64(b.last)
 		// Read up to the byte before
 		skip = 1
 	}
 
 	for i := 0; i < nbytes-skip; i++ {
-		buffer = buffer | (uint64(b.stream[b.streamOffset+i]) << uint(8*(nbytes-i-1)))
+		buffer |= (uint64(b.stream[b.streamOffset+i]) << uint(8*(nbytes-i-1)))
 	}
 
 	b.buffer = buffer

tsdb/chunkenc/float_histogram.go

@@ -785,7 +785,7 @@ func (it *floatHistogramIterator) Next() ValueType {
 		it.err = err
 		return ValNone
 	}
-	it.tDelta = it.tDelta + tDod
+	it.tDelta += tDod
 	it.t += it.tDelta
 
 	if ok := it.readXor(&it.cnt.value, &it.cnt.leading, &it.cnt.trailing); !ok {

tsdb/chunkenc/histogram.go

@@ -875,7 +875,7 @@ func (it *histogramIterator) Next() ValueType {
 		it.err = err
 		return ValNone
 	}
-	it.tDelta = it.tDelta + tDod
+	it.tDelta += tDod
 	it.t += it.tDelta
 
 	cntDod, err := readVarbitInt(&it.br)
@@ -883,7 +883,7 @@ func (it *histogramIterator) Next() ValueType {
 		it.err = err
 		return ValNone
 	}
-	it.cntDelta = it.cntDelta + cntDod
+	it.cntDelta += cntDod
 	it.cnt = uint64(int64(it.cnt) + it.cntDelta)
 
 	zcntDod, err := readVarbitInt(&it.br)
@@ -891,7 +891,7 @@ func (it *histogramIterator) Next() ValueType {
 		it.err = err
 		return ValNone
 	}
-	it.zCntDelta = it.zCntDelta + zcntDod
+	it.zCntDelta += zcntDod
 	it.zCnt = uint64(int64(it.zCnt) + it.zCntDelta)
 
 	ok := it.readSum()

tsdb/chunkenc/varbit.go

@@ -122,7 +122,7 @@ func readVarbitInt(b *bstreamReader) (int64, error) {
 		}
 		if bits > (1 << (sz - 1)) {
 			// Or something.
-			bits = bits - (1 << sz)
+			bits -= (1 << sz)
 		}
 		val = int64(bits)
 	}

tsdb/chunkenc/xor.go

@@ -163,15 +163,15 @@ func (a *xorAppender) AppendFloatHistogram(t int64, h *histogram.FloatHistogram)
 func (a *xorAppender) Append(t int64, v float64) {
 	var tDelta uint64
 	num := binary.BigEndian.Uint16(a.b.bytes())
-
+	switch {
-	if num == 0 {
+	case num == 0:
 		buf := make([]byte, binary.MaxVarintLen64)
 		for _, b := range buf[:binary.PutVarint(buf, t)] {
 			a.b.writeByte(b)
 		}
 		a.b.writeBits(math.Float64bits(v), 64)
 
-	} else if num == 1 {
+	case num == 1:
 		tDelta = uint64(t - a.t)
 
 		buf := make([]byte, binary.MaxVarintLen64)
@@ -181,7 +181,7 @@ func (a *xorAppender) Append(t int64, v float64) {
 
 		a.writeVDelta(v)
 
-	} else {
+	default:
 		tDelta = uint64(t - a.t)
 		dod := int64(tDelta - a.tDelta)
 
@@ -321,7 +321,7 @@ func (it *xorIterator) Next() ValueType {
 			return ValNone
 		}
 		it.tDelta = tDelta
-		it.t = it.t + int64(it.tDelta)
+		it.t += int64(it.tDelta)
 
 		return it.readValue()
 	}
@@ -384,7 +384,7 @@ func (it *xorIterator) Next() ValueType {
 	}
 
 	it.tDelta = uint64(int64(it.tDelta) + dod)
-	it.t = it.t + int64(it.tDelta)
+	it.t += int64(it.tDelta)
 
 	return it.readValue()
 }

tsdb/chunks/head_chunks_test.go

@@ -503,10 +503,10 @@ func createChunkDiskMapper(t *testing.T, dir string) *ChunkDiskMapper {
 
 func randomChunk(t *testing.T) chunkenc.Chunk {
 	chunk := chunkenc.NewXORChunk()
-	len := rand.Int() % 120
+	length := rand.Int() % 120
 	app, err := chunk.Appender()
 	require.NoError(t, err)
-	for i := 0; i < len; i++ {
+	for i := 0; i < length; i++ {
 		app.Append(rand.Int63(), rand.Float64())
 	}
 	return chunk

tsdb/compact.go

@@ -44,7 +44,7 @@ func ExponentialBlockRanges(minSize int64, steps, stepSize int) []int64 {
 	curRange := minSize
 	for i := 0; i < steps; i++ {
 		ranges = append(ranges, curRange)
-		curRange = curRange * int64(stepSize)
+		curRange *= int64(stepSize)
 	}
 
 	return ranges

tsdb/compact_test.go

@@ -1452,12 +1452,6 @@ func TestSparseHistogramSpaceSavings(t *testing.T) {
 		{100, 15, 3, 5},
 		{100, 50, 3, 3},
 		{100, 100, 3, 2},
-		//{1000, 15, 1, 0},
-		//{1000, 50, 1, 0},
-		//{1000, 100, 1, 0},
-		//{1000, 15, 3, 5},
-		//{1000, 50, 3, 3},
-		//{1000, 100, 3, 2},
 	}
 
 	type testSummary struct {

tsdb/db.go

@@ -260,7 +260,7 @@ func newDBMetrics(db *DB, r prometheus.Registerer) *dbMetrics {
 		Help: "Size of symbol table in memory for loaded blocks",
 	}, func() float64 {
 		db.mtx.RLock()
-		blocks := db.blocks[:]
+		blocks := db.blocks
 		db.mtx.RUnlock()
 		symTblSize := uint64(0)
 		for _, b := range blocks {
@@ -1186,7 +1186,7 @@ func (db *DB) compactOOO(dest string, oooHead *OOOCompactionHead) (_ []ulid.ULID
 		}
 	}()
 
-	for t := blockSize * (oooHeadMint / blockSize); t <= oooHeadMaxt; t = t + blockSize {
+	for t := blockSize * (oooHeadMint / blockSize); t <= oooHeadMaxt; t += blockSize {
 		mint, maxt := t, t+blockSize
 		// Block intervals are half-open: [b.MinTime, b.MaxTime). Block intervals are always +1 than the total samples it includes.
 		uid, err := db.compactor.Write(dest, oooHead.CloneForTimeRange(mint, maxt-1), mint, maxt, nil)
@@ -1508,7 +1508,7 @@ func BeyondSizeRetention(db *DB, blocks []*Block) (deletable map[ulid.ULID]struc
 	blocksSize := db.Head().Size()
 	for i, block := range blocks {
 		blocksSize += block.Size()
-		if blocksSize > int64(db.opts.MaxBytes) {
+		if blocksSize > db.opts.MaxBytes {
 			// Add this and all following blocks for deletion.
 			for _, b := range blocks[i:] {
 				deletable[b.meta.ULID] = struct{}{}

tsdb/db_test.go

@@ -1076,7 +1076,7 @@ func TestWALSegmentSizeOptions(t *testing.T) {
 
 			dbDir := db.Dir()
 			require.NoError(t, db.Close())
-			testFunc(dbDir, int(opts.WALSegmentSize))
+			testFunc(dbDir, opts.WALSegmentSize)
 		})
 	}
 }
@@ -2996,7 +2996,7 @@ func TestCompactHead(t *testing.T) {
 		series = seriesSet.At().Iterator(series)
 		for series.Next() == chunkenc.ValFloat {
 			time, val := series.At()
-			actSamples = append(actSamples, sample{int64(time), val, nil, nil})
+			actSamples = append(actSamples, sample{time, val, nil, nil})
 		}
 		require.NoError(t, series.Err())
 	}

tsdb/exemplar.go

@@ -115,17 +115,17 @@ func NewExemplarMetrics(reg prometheus.Registerer) *ExemplarMetrics {
 // 1GB of extra memory, accounting for the fact that this is heap allocated space.
 // If len <= 0, then the exemplar storage is essentially a noop storage but can later be
 // resized to store exemplars.
-func NewCircularExemplarStorage(len int64, m *ExemplarMetrics) (ExemplarStorage, error) {
+func NewCircularExemplarStorage(length int64, m *ExemplarMetrics) (ExemplarStorage, error) {
-	if len < 0 {
+	if length < 0 {
-		len = 0
+		length = 0
 	}
 	c := &CircularExemplarStorage{
-		exemplars: make([]*circularBufferEntry, len),
+		exemplars: make([]*circularBufferEntry, length),
-		index:     make(map[string]*indexEntry, len/estimatedExemplarsPerSeries),
+		index:     make(map[string]*indexEntry, length/estimatedExemplarsPerSeries),
 		metrics:   m,
 	}
 
-	c.metrics.maxExemplars.Set(float64(len))
+	c.metrics.maxExemplars.Set(float64(length))
 
 	return c, nil
 }
@@ -151,7 +151,7 @@ func (ce *CircularExemplarStorage) Querier(_ context.Context) (storage.ExemplarQ
 func (ce *CircularExemplarStorage) Select(start, end int64, matchers ...[]*labels.Matcher) ([]exemplar.QueryResult, error) {
 	ret := make([]exemplar.QueryResult, 0)
 
-	if len(ce.exemplars) <= 0 {
+	if len(ce.exemplars) == 0 {
 		return ret, nil
 	}
 
@@ -219,7 +219,7 @@ func (ce *CircularExemplarStorage) ValidateExemplar(l labels.Labels, e exemplar.
 // Not thread safe. The append parameters tells us whether this is an external validation, or internal
 // as a result of an AddExemplar call, in which case we should update any relevant metrics.
 func (ce *CircularExemplarStorage) validateExemplar(key []byte, e exemplar.Exemplar, append bool) error {
-	if len(ce.exemplars) <= 0 {
+	if len(ce.exemplars) == 0 {
 		return storage.ErrExemplarsDisabled
 	}
 
@@ -334,7 +334,7 @@ func (ce *CircularExemplarStorage) migrate(entry *circularBufferEntry) {
 }
 
 func (ce *CircularExemplarStorage) AddExemplar(l labels.Labels, e exemplar.Exemplar) error {
-	if len(ce.exemplars) <= 0 {
+	if len(ce.exemplars) == 0 {
 		return storage.ErrExemplarsDisabled
 	}
 

tsdb/head.go

@@ -1453,7 +1453,7 @@ func (h *Head) Delete(mint, maxt int64, ms ...*labels.Matcher) error {
 		}
 	}
 	for _, s := range stones {
-		h.tombstones.AddInterval(storage.SeriesRef(s.Ref), s.Intervals[0])
+		h.tombstones.AddInterval(s.Ref, s.Intervals[0])
 	}
 
 	return nil

tsdb/head_test.go

@@ -3005,7 +3005,7 @@ func TestHistogramInWALAndMmapChunk(t *testing.T) {
 			hists = tsdbutil.GenerateTestHistograms(numHistograms)
 		}
 		for _, h := range hists {
-			h.Count = h.Count * 2
+			h.Count *= 2
 			h.NegativeSpans = h.PositiveSpans
 			h.NegativeBuckets = h.PositiveBuckets
 			_, err := app.AppendHistogram(0, s1, ts, h, nil)
@@ -3028,7 +3028,7 @@ func TestHistogramInWALAndMmapChunk(t *testing.T) {
 			hists = tsdbutil.GenerateTestFloatHistograms(numHistograms)
 		}
 		for _, h := range hists {
-			h.Count = h.Count * 2
+			h.Count *= 2
 			h.NegativeSpans = h.PositiveSpans
 			h.NegativeBuckets = h.PositiveBuckets
 			_, err := app.AppendHistogram(0, s1, ts, nil, h)
@@ -3069,26 +3069,26 @@ func TestHistogramInWALAndMmapChunk(t *testing.T) {
 		}
 		for _, h := range hists {
 			ts++
-			h.Count = h.Count * 2
+			h.Count *= 2
 			h.NegativeSpans = h.PositiveSpans
 			h.NegativeBuckets = h.PositiveBuckets
-			_, err := app.AppendHistogram(0, s2, int64(ts), h, nil)
+			_, err := app.AppendHistogram(0, s2, ts, h, nil)
 			require.NoError(t, err)
 			eh := h.Copy()
 			if !gauge && ts > 30 && (ts-10)%20 == 1 {
 				// Need "unknown" hint after float sample.
 				eh.CounterResetHint = histogram.UnknownCounterReset
 			}
-			exp[k2] = append(exp[k2], sample{t: int64(ts), h: eh})
+			exp[k2] = append(exp[k2], sample{t: ts, h: eh})
 			if ts%20 == 0 {
 				require.NoError(t, app.Commit())
 				app = head.Appender(context.Background())
 				// Add some float.
 				for i := 0; i < 10; i++ {
 					ts++
-					_, err := app.Append(0, s2, int64(ts), float64(ts))
+					_, err := app.Append(0, s2, ts, float64(ts))
 					require.NoError(t, err)
-					exp[k2] = append(exp[k2], sample{t: int64(ts), f: float64(ts)})
+					exp[k2] = append(exp[k2], sample{t: ts, f: float64(ts)})
 				}
 				require.NoError(t, app.Commit())
 				app = head.Appender(context.Background())
@@ -3106,26 +3106,26 @@ func TestHistogramInWALAndMmapChunk(t *testing.T) {
 		}
 		for _, h := range hists {
 			ts++
-			h.Count = h.Count * 2
+			h.Count *= 2
 			h.NegativeSpans = h.PositiveSpans
 			h.NegativeBuckets = h.PositiveBuckets
-			_, err := app.AppendHistogram(0, s2, int64(ts), nil, h)
+			_, err := app.AppendHistogram(0, s2, ts, nil, h)
 			require.NoError(t, err)
 			eh := h.Copy()
 			if !gauge && ts > 30 && (ts-10)%20 == 1 {
 				// Need "unknown" hint after float sample.
 				eh.CounterResetHint = histogram.UnknownCounterReset
 			}
-			exp[k2] = append(exp[k2], sample{t: int64(ts), fh: eh})
+			exp[k2] = append(exp[k2], sample{t: ts, fh: eh})
 			if ts%20 == 0 {
 				require.NoError(t, app.Commit())
 				app = head.Appender(context.Background())
 				// Add some float.
 				for i := 0; i < 10; i++ {
 					ts++
-					_, err := app.Append(0, s2, int64(ts), float64(ts))
+					_, err := app.Append(0, s2, ts, float64(ts))
 					require.NoError(t, err)
-					exp[k2] = append(exp[k2], sample{t: int64(ts), f: float64(ts)})
+					exp[k2] = append(exp[k2], sample{t: ts, f: float64(ts)})
 				}
 				require.NoError(t, app.Commit())
 				app = head.Appender(context.Background())
@@ -4495,11 +4495,12 @@ func TestHistogramValidation(t *testing.T) {
 			}
 
 			err = ValidateFloatHistogram(tc.h.ToFloat())
-			if tc.errMsgFloat != "" {
+			switch {
+			case tc.errMsgFloat != "":
 				require.ErrorContains(t, err, tc.errMsgFloat)
-			} else if tc.errMsg != "" {
+			case tc.errMsg != "":
 				require.ErrorContains(t, err, tc.errMsg)
-			} else {
+			default:
 				require.NoError(t, err)
 			}
 		})

tsdb/head_wal.go

@@ -299,7 +299,7 @@ Outer:
 						unknownRefs.Inc()
 						continue
 					}
-					h.tombstones.AddInterval(storage.SeriesRef(s.Ref), itv)
+					h.tombstones.AddInterval(s.Ref, itv)
 				}
 			}
 			tstonesPool.Put(v)
@@ -382,7 +382,7 @@ Outer:
 			floatHistogramsPool.Put(v)
 		case []record.RefMetadata:
 			for _, m := range v {
-				s := h.series.getByID(chunks.HeadSeriesRef(m.Ref))
+				s := h.series.getByID(m.Ref)
 				if s == nil {
 					unknownMetadataRefs.Inc()
 					continue

tsdb/index/index.go

@@ -536,7 +536,7 @@ func (w *Writer) finishSymbols() error {
 	// Write out the length and symbol count.
 	w.buf1.Reset()
 	w.buf1.PutBE32int(int(symbolTableSize))
-	w.buf1.PutBE32int(int(w.numSymbols))
+	w.buf1.PutBE32int(w.numSymbols)
 	if err := w.writeAt(w.buf1.Get(), w.toc.Symbols); err != nil {
 		return err
 	}

tsdb/index/postings.go

@@ -561,12 +561,10 @@ func newMergedPostings(p []Postings) (m *mergedPostings, nonEmpty bool) {
 		// NOTE: mergedPostings struct requires the user to issue an initial Next.
 		if it.Next() {
 			ph = append(ph, it)
-		} else {
+		} else if it.Err() != nil {
-			if it.Err() != nil {
 			return &mergedPostings{err: it.Err()}, true
 		}
 	}
-	}
 
 	if len(ph) == 0 {
 		return nil, false
@@ -699,15 +697,16 @@ func (rp *removedPostings) Next() bool {
 		}
 
 		fcur, rcur := rp.full.At(), rp.remove.At()
-		if fcur < rcur {
+		switch {
+		case fcur < rcur:
 			rp.cur = fcur
 			rp.fok = rp.full.Next()
 
 			return true
-		} else if rcur < fcur {
+		case rcur < fcur:
 			// Forward the remove postings to the right position.
 			rp.rok = rp.remove.Seek(fcur)
-		} else {
+		default:
 			// Skip the current posting.
 			rp.fok = rp.full.Next()
 		}

tsdb/index/postingsstats.go

@@ -31,10 +31,10 @@ type maxHeap struct {
 	Items     []Stat
 }
 
-func (m *maxHeap) init(len int) {
+func (m *maxHeap) init(length int) {
-	m.maxLength = len
+	m.maxLength = length
 	m.minValue = math.MaxUint64
-	m.Items = make([]Stat, 0, len)
+	m.Items = make([]Stat, 0, length)
 }
 
 func (m *maxHeap) push(item Stat) {

tsdb/isolation.go

@@ -254,7 +254,7 @@ func (txr *txRing) add(appendID uint64) {
 	if txr.txIDCount == len(txr.txIDs) {
 		// Ring buffer is full, expand by doubling.
 		newRing := make([]uint64, txr.txIDCount*2)
-		idx := copy(newRing[:], txr.txIDs[txr.txIDFirst:])
+		idx := copy(newRing, txr.txIDs[txr.txIDFirst:])
 		copy(newRing[idx:], txr.txIDs[:txr.txIDFirst])
 		txr.txIDs = newRing
 		txr.txIDFirst = 0

tsdb/querier.go

@@ -239,18 +239,20 @@ func PostingsForMatchers(ix IndexReader, ms ...*labels.Matcher) (index.Postings,
 	}
 
 	for _, m := range ms {
-		if m.Name == "" && m.Value == "" { // Special-case for AllPostings, used in tests at least.
+		switch {
+		case m.Name == "" && m.Value == "": // Special-case for AllPostings, used in tests at least.
 			k, v := index.AllPostingsKey()
 			allPostings, err := ix.Postings(k, v)
 			if err != nil {
 				return nil, err
 			}
 			its = append(its, allPostings)
-		} else if labelMustBeSet[m.Name] {
+		case labelMustBeSet[m.Name]:
 			// If this matcher must be non-empty, we can be smarter.
 			matchesEmpty := m.Matches("")
 			isNot := m.Type == labels.MatchNotEqual || m.Type == labels.MatchNotRegexp
-			if isNot && matchesEmpty { // l!="foo"
+			switch {
+			case isNot && matchesEmpty: // l!="foo"
 				// If the label can't be empty and is a Not and the inner matcher
 				// doesn't match empty, then subtract it out at the end.
 				inverse, err := m.Inverse()
@@ -263,7 +265,7 @@ func PostingsForMatchers(ix IndexReader, ms ...*labels.Matcher) (index.Postings,
 					return nil, err
 				}
 				notIts = append(notIts, it)
-			} else if isNot && !matchesEmpty { // l!=""
+			case isNot && !matchesEmpty: // l!=""
 				// If the label can't be empty and is a Not, but the inner matcher can
 				// be empty we need to use inversePostingsForMatcher.
 				inverse, err := m.Inverse()
@@ -279,7 +281,7 @@ func PostingsForMatchers(ix IndexReader, ms ...*labels.Matcher) (index.Postings,
 					return index.EmptyPostings(), nil
 				}
 				its = append(its, it)
-			} else { // l="a"
+			default: // l="a"
 				// Non-Not matcher, use normal postingsForMatcher.
 				it, err := postingsForMatcher(ix, m)
 				if err != nil {
@@ -290,7 +292,7 @@ func PostingsForMatchers(ix IndexReader, ms ...*labels.Matcher) (index.Postings,
 				}
 				its = append(its, it)
 			}
-		} else { // l=""
+		default: // l=""
 			// If the matchers for a labelname selects an empty value, it selects all
 			// the series which don't have the label name set too. See:
 			// https://github.com/prometheus/prometheus/issues/3575 and
@@ -965,24 +967,24 @@ func (m *mergedStringIter) Next() bool {
 	if (!m.aok && !m.bok) || (m.Err() != nil) {
 		return false
 	}
-
+	switch {
-	if !m.aok {
+	case !m.aok:
 		m.cur = m.b.At()
 		m.bok = m.b.Next()
 		m.err = m.b.Err()
-	} else if !m.bok {
+	case !m.bok:
 		m.cur = m.a.At()
 		m.aok = m.a.Next()
 		m.err = m.a.Err()
-	} else if m.b.At() > m.a.At() {
+	case m.b.At() > m.a.At():
 		m.cur = m.a.At()
 		m.aok = m.a.Next()
 		m.err = m.a.Err()
-	} else if m.a.At() > m.b.At() {
+	case m.a.At() > m.b.At():
 		m.cur = m.b.At()
 		m.bok = m.b.Next()
 		m.err = m.b.Err()
-	} else { // Equal.
+	default: // Equal.
 		m.cur = m.b.At()
 		m.aok = m.a.Next()
 		m.err = m.a.Err()

tsdb/querier_test.go

@@ -113,7 +113,7 @@ func createIdxChkReaders(t *testing.T, tc []seriesSamples) (IndexReader, ChunkRe
 
 	var chunkRef chunks.ChunkRef
 	for i, s := range tc {
-		i = i + 1 // 0 is not a valid posting.
+		i++ // 0 is not a valid posting.
 		metas := make([]chunks.Meta, 0, len(s.chunks))
 		for _, chk := range s.chunks {
 			if chk[0].t < blockMint {
@@ -2012,7 +2012,7 @@ func BenchmarkQueries(b *testing.B) {
 				for x := 0; x <= 10; x++ {
 					block, err := OpenBlock(nil, createBlock(b, dir, series), nil)
 					require.NoError(b, err)
-					q, err := NewBlockQuerier(block, 1, int64(nSamples))
+					q, err := NewBlockQuerier(block, 1, nSamples)
 					require.NoError(b, err)
 					qs = append(qs, q)
 				}

tsdb/wal.go

@@ -90,7 +90,7 @@ func newWalMetrics(r prometheus.Registerer) *walMetrics {
 // WAL is a write ahead log that can log new series labels and samples.
 // It must be completely read before new entries are logged.
 //
-// DEPRECATED: use wlog pkg combined with the record codex instead.
+// Deprecated: use wlog pkg combined with the record codex instead.
 type WAL interface {
 	Reader() WALReader
 	LogSeries([]record.RefSeries) error
@@ -147,7 +147,7 @@ func newCRC32() hash.Hash32 {
 
 // SegmentWAL is a write ahead log for series data.
 //
-// DEPRECATED: use wlog pkg combined with the record coders instead.
+// Deprecated: use wlog pkg combined with the record coders instead.
 type SegmentWAL struct {
 	mtx     sync.Mutex
 	metrics *walMetrics

util/runtime/limits_default.go

@@ -39,7 +39,7 @@ func getLimits(resource int, unit string) string {
 	if err != nil {
 		panic("syscall.Getrlimit failed: " + err.Error())
 	}
-	return fmt.Sprintf("(soft=%s, hard=%s)", limitToString(uint64(rlimit.Cur), unit), limitToString(uint64(rlimit.Max), unit))
+	return fmt.Sprintf("(soft=%s, hard=%s)", limitToString(rlimit.Cur, unit), limitToString(rlimit.Max, unit))
 }
 
 // FdLimits returns the soft and hard limits for file descriptors.

util/runtime/statfs_default.go

@@ -72,11 +72,13 @@ func Statfs(path string) string {
 
 	var fs syscall.Statfs_t
 	err := syscall.Statfs(path, &fs)
+	//nolint:unconvert // This ensure Type format on all Platforms
+	localType := int64(fs.Type)
 	if err != nil {
-		return strconv.FormatInt(int64(fs.Type), 16)
+		return strconv.FormatInt(localType, 16)
 	}
-	if fsType, ok := fsTypes[int64(fs.Type)]; ok {
+	if fsType, ok := fsTypes[localType]; ok {
 		return fsType
 	}
-	return strconv.FormatInt(int64(fs.Type), 16)
+	return strconv.FormatInt(localType, 16)
 }

web/api/v1/api.go

@@ -243,7 +243,7 @@ func NewAPI(
 	remoteReadConcurrencyLimit int,
 	remoteReadMaxBytesInFrame int,
 	isAgent bool,
-	CORSOrigin *regexp.Regexp,
+	corsOrigin *regexp.Regexp,
 	runtimeInfo func() (RuntimeInfo, error),
 	buildInfo *PrometheusVersion,
 	gatherer prometheus.Gatherer,
@@ -269,7 +269,7 @@ func NewAPI(
 		enableAdmin:      enableAdmin,
 		rulesRetriever:   rr,
 		logger:           logger,
-		CORSOrigin:       CORSOrigin,
+		CORSOrigin:       corsOrigin,
 		runtimeInfo:      runtimeInfo,
 		buildInfo:        buildInfo,
 		gatherer:         gatherer,

web/api/v1/api_test.go

@@ -2791,7 +2791,7 @@ func TestRespondSuccess(t *testing.T) {
 	}
 
 	var res response
-	if err = json.Unmarshal([]byte(body), &res); err != nil {
+	if err = json.Unmarshal(body, &res); err != nil {
 		t.Fatalf("Error unmarshaling JSON body: %s", err)
 	}
 
@@ -2827,7 +2827,7 @@ func TestRespondError(t *testing.T) {
 	}
 
 	var res response
-	if err = json.Unmarshal([]byte(body), &res); err != nil {
+	if err = json.Unmarshal(body, &res); err != nil {
 		t.Fatalf("Error unmarshaling JSON body: %s", err)
 	}
 

web/web.go

@@ -719,9 +719,9 @@ func (h *Handler) runtimeInfo() (api_v1.RuntimeInfo, error) {
 	}
 	if h.options.TSDBMaxBytes != 0 {
 		if status.StorageRetention != "" {
-			status.StorageRetention = status.StorageRetention + " or "
+			status.StorageRetention += " or "
 		}
-		status.StorageRetention = status.StorageRetention + h.options.TSDBMaxBytes.String()
+		status.StorageRetention += h.options.TSDBMaxBytes.String()
 	}
 
 	metrics, err := h.gatherer.Gather()