lint: Adjust to the lint warnings raised by current versions of golint-ci

We haven't updated golint-ci in our CI yet, but this commit prepares
for that.

There are a lot of new warnings, and it is mostly because the "revive"
linter got updated. I agree with most of the new warnings, mostly
around not naming unused function parameters (although it is justified
in some cases for documentation purposes – while things like mocks are
a good example where not naming the parameter is clearer).

I'm pretty upset about the "empty block" warning to include `for`
loops. It's such a common pattern to do something in the head of the
`for` loop and then have an empty block. There is still an open issue
about this: https://github.com/mgechev/revive/issues/810 I have
disabled "revive" altogether in files where empty blocks are used
excessively, and I have made the effort to add individual
`// nolint:revive` where empty blocks are used just once or twice.
It's borderline noisy, though, but let's go with it for now.

I should mention that none of the "empty block" warnings for `for`
loop bodies were legitimate.

Signed-off-by: beorn7 <beorn@grafana.com>

cmd/prometheus/main.go

@@ -12,6 +12,7 @@
 // limitations under the License.
 
 // The main package for the Prometheus server executable.
+// nolint:revive // Many unsued function arguments in this file by design.
 package main
 
 import (

cmd/promtool/backfill_test.go

@@ -44,7 +44,7 @@ func sortSamples(samples []backfillSample) {
 	})
 }
 
-func queryAllSeries(t testing.TB, q storage.Querier, expectedMinTime, expectedMaxTime int64) []backfillSample {
+func queryAllSeries(t testing.TB, q storage.Querier, expectedMinTime, expectedMaxTime int64) []backfillSample { // nolint:revive
 	ss := q.Select(false, nil, labels.MustNewMatcher(labels.MatchRegexp, "", ".*"))
 	samples := []backfillSample{}
 	for ss.Next() {

cmd/promtool/rules.go

@@ -68,7 +68,7 @@ func newRuleImporter(logger log.Logger, config ruleImporterConfig, apiClient que
 }
 
 // loadGroups parses groups from a list of recording rule files.
-func (importer *ruleImporter) loadGroups(ctx context.Context, filenames []string) (errs []error) {
+func (importer *ruleImporter) loadGroups(_ context.Context, filenames []string) (errs []error) {
 	groups, errs := importer.ruleManager.LoadGroups(importer.config.evalInterval, labels.Labels{}, "", nil, filenames...)
 	if errs != nil {
 		return errs

cmd/promtool/rules_test.go

@@ -35,7 +35,7 @@ type mockQueryRangeAPI struct {
 	samples model.Matrix
 }
 
-func (mockAPI mockQueryRangeAPI) QueryRange(ctx context.Context, query string, r v1.Range, opts ...v1.Option) (model.Value, v1.Warnings, error) {
+func (mockAPI mockQueryRangeAPI) QueryRange(_ context.Context, query string, r v1.Range, opts ...v1.Option) (model.Value, v1.Warnings, error) { // nolint:revive
 	return mockAPI.samples, v1.Warnings{}, nil
 }
 
@@ -161,7 +161,7 @@ func TestBackfillRuleIntegration(t *testing.T) {
 	}
 }
 
-func newTestRuleImporter(ctx context.Context, start time.Time, tmpDir string, testSamples model.Matrix, maxBlockDuration time.Duration) (*ruleImporter, error) {
+func newTestRuleImporter(_ context.Context, start time.Time, tmpDir string, testSamples model.Matrix, maxBlockDuration time.Duration) (*ruleImporter, error) {
 	logger := log.NewNopLogger()
 	cfg := ruleImporterConfig{
 		outputDir:        tmpDir,

discovery/aws/ec2.go

@@ -164,7 +164,7 @@ func NewEC2Discovery(conf *EC2SDConfig, logger log.Logger) *EC2Discovery {
 	return d
 }
 
-func (d *EC2Discovery) ec2Client(ctx context.Context) (*ec2.EC2, error) {
+func (d *EC2Discovery) ec2Client(context.Context) (*ec2.EC2, error) {
 	if d.ec2 != nil {
 		return d.ec2, nil
 	}

discovery/hetzner/hcloud.go

@@ -59,7 +59,7 @@ type hcloudDiscovery struct {
 }
 
 // newHcloudDiscovery returns a new hcloudDiscovery which periodically refreshes its targets.
-func newHcloudDiscovery(conf *SDConfig, logger log.Logger) (*hcloudDiscovery, error) {
+func newHcloudDiscovery(conf *SDConfig, _ log.Logger) (*hcloudDiscovery, error) {
 	d := &hcloudDiscovery{
 		port: conf.Port,
 	}

discovery/hetzner/robot.go

@@ -51,7 +51,7 @@ type robotDiscovery struct {
 }
 
 // newRobotDiscovery returns a new robotDiscovery which periodically refreshes its targets.
-func newRobotDiscovery(conf *SDConfig, logger log.Logger) (*robotDiscovery, error) {
+func newRobotDiscovery(conf *SDConfig, _ log.Logger) (*robotDiscovery, error) {
 	d := &robotDiscovery{
 		port:     conf.Port,
 		endpoint: conf.robotEndpoint,
@@ -69,7 +69,7 @@ func newRobotDiscovery(conf *SDConfig, logger log.Logger) (*robotDiscovery, erro
 	return d, nil
 }
 
-func (d *robotDiscovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
+func (d *robotDiscovery) refresh(context.Context) ([]*targetgroup.Group, error) {
 	req, err := http.NewRequest("GET", d.endpoint+"/server", nil)
 	if err != nil {
 		return nil, err

discovery/ionos/server.go

@@ -60,7 +60,7 @@ type serverDiscovery struct {
 	datacenterID string
 }
 
-func newServerDiscovery(conf *SDConfig, logger log.Logger) (*serverDiscovery, error) {
+func newServerDiscovery(conf *SDConfig, _ log.Logger) (*serverDiscovery, error) {
 	d := &serverDiscovery{
 		port:         conf.Port,
 		datacenterID: conf.DatacenterID,

discovery/kubernetes/client_metrics.go

@@ -122,11 +122,11 @@ func (f *clientGoRequestMetricAdapter) Register(registerer prometheus.Registerer
 	)
 }
 
-func (clientGoRequestMetricAdapter) Increment(ctx context.Context, code, method, host string) {
+func (clientGoRequestMetricAdapter) Increment(_ context.Context, code, _, _ string) {
 	clientGoRequestResultMetricVec.WithLabelValues(code).Inc()
 }
 
-func (clientGoRequestMetricAdapter) Observe(ctx context.Context, verb string, u url.URL, latency time.Duration) {
+func (clientGoRequestMetricAdapter) Observe(_ context.Context, _ string, u url.URL, latency time.Duration) {
 	clientGoRequestLatencyMetricVec.WithLabelValues(u.EscapedPath()).Observe(latency.Seconds())
 }
 
@@ -169,7 +169,7 @@ func (f *clientGoWorkqueueMetricsProvider) NewLongestRunningProcessorSecondsMetr
 	return clientGoWorkqueueLongestRunningProcessorMetricVec.WithLabelValues(name)
 }
 
-func (clientGoWorkqueueMetricsProvider) NewRetriesMetric(name string) workqueue.CounterMetric {
+func (clientGoWorkqueueMetricsProvider) NewRetriesMetric(string) workqueue.CounterMetric {
 	// Retries are not used so the metric is omitted.
 	return noopMetric{}
 }

discovery/kubernetes/endpoints.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// nolint:revive // Many legitimately empty blocks in this file.
 package kubernetes
 
 import (

discovery/kubernetes/endpointslice.go

@@ -190,7 +190,7 @@ func (e *EndpointSlice) Run(ctx context.Context, ch chan<- []*targetgroup.Group)
 	}
 
 	go func() {
-		for e.process(ctx, ch) {
+		for e.process(ctx, ch) { // nolint:revive
 		}
 	}()
 

discovery/kubernetes/ingress.go

@@ -89,7 +89,7 @@ func (i *Ingress) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 	}
 
 	go func() {
-		for i.process(ctx, ch) {
+		for i.process(ctx, ch) { // nolint:revive
 		}
 	}()
 

discovery/kubernetes/node.go

@@ -96,7 +96,7 @@ func (n *Node) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 	}
 
 	go func() {
-		for n.process(ctx, ch) {
+		for n.process(ctx, ch) { // nolint:revive
 		}
 	}()
 

discovery/kubernetes/pod.go

@@ -132,7 +132,7 @@ func (p *Pod) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 	}
 
 	go func() {
-		for p.process(ctx, ch) {
+		for p.process(ctx, ch) { // nolint:revive
 		}
 	}()
 

discovery/kubernetes/service.go

@@ -92,7 +92,7 @@ func (s *Service) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 	}
 
 	go func() {
-		for s.process(ctx, ch) {
+		for s.process(ctx, ch) { // nolint:revive
 		}
 	}()
 

discovery/legacymanager/manager_test.go

@@ -686,12 +686,7 @@ func TestTargetUpdatesOrder(t *testing.T) {
 				case tgs := <-provUpdates:
 					discoveryManager.updateGroup(poolKey{setName: strconv.Itoa(i), provider: tc.title}, tgs)
 					for _, got := range discoveryManager.allGroups() {
-						assertEqualGroups(t, got, tc.expectedTargets[x], func(got, expected string) string {
-							return fmt.Sprintf("%d: \ntargets mismatch \ngot: %v \nexpected: %v",
-								x,
-								got,
-								expected)
-						})
+						assertEqualGroups(t, got, tc.expectedTargets[x])
 					}
 				}
 			}
@@ -699,7 +694,7 @@ func TestTargetUpdatesOrder(t *testing.T) {
 	}
 }
 
-func assertEqualGroups(t *testing.T, got, expected []*targetgroup.Group, msg func(got, expected string) string) {
+func assertEqualGroups(t *testing.T, got, expected []*targetgroup.Group) {
 	t.Helper()
 
 	// Need to sort by the groups's source as the received order is not guaranteed.
@@ -1079,9 +1074,7 @@ func TestCoordinationWithReceiver(t *testing.T) {
 						if _, ok := tgs[k]; !ok {
 							t.Fatalf("step %d: target group not found: %s\ngot: %#v", i, k, tgs)
 						}
-						assertEqualGroups(t, tgs[k], expected.tgs[k], func(got, expected string) string {
-							return fmt.Sprintf("step %d: targets mismatch \ngot: %q \nexpected: %q", i, got, expected)
-						})
+						assertEqualGroups(t, tgs[k], expected.tgs[k])
 					}
 				}
 			}

discovery/manager_test.go

@@ -686,12 +686,7 @@ func TestTargetUpdatesOrder(t *testing.T) {
 				case tgs := <-provUpdates:
 					discoveryManager.updateGroup(poolKey{setName: strconv.Itoa(i), provider: tc.title}, tgs)
 					for _, got := range discoveryManager.allGroups() {
-						assertEqualGroups(t, got, tc.expectedTargets[x], func(got, expected string) string {
-							return fmt.Sprintf("%d: \ntargets mismatch \ngot: %v \nexpected: %v",
-								x,
-								got,
-								expected)
-						})
+						assertEqualGroups(t, got, tc.expectedTargets[x])
 					}
 				}
 			}
@@ -699,7 +694,7 @@ func TestTargetUpdatesOrder(t *testing.T) {
 	}
 }
 
-func assertEqualGroups(t *testing.T, got, expected []*targetgroup.Group, msg func(got, expected string) string) {
+func assertEqualGroups(t *testing.T, got, expected []*targetgroup.Group) {
 	t.Helper()
 
 	// Need to sort by the groups's source as the received order is not guaranteed.
@@ -1129,7 +1124,7 @@ type lockStaticConfig struct {
 }
 
 func (s lockStaticConfig) Name() string { return "lockstatic" }
-func (s lockStaticConfig) NewDiscoverer(options DiscovererOptions) (Discoverer, error) {
+func (s lockStaticConfig) NewDiscoverer(DiscovererOptions) (Discoverer, error) {
 	return (lockStaticDiscoverer)(s), nil
 }
 
@@ -1330,9 +1325,7 @@ func TestCoordinationWithReceiver(t *testing.T) {
 						if _, ok := tgs[k]; !ok {
 							t.Fatalf("step %d: target group not found: %s\ngot: %#v", i, k, tgs)
 						}
-						assertEqualGroups(t, tgs[k], expected.tgs[k], func(got, expected string) string {
-							return fmt.Sprintf("step %d: targets mismatch \ngot: %q \nexpected: %q", i, got, expected)
-						})
+						assertEqualGroups(t, tgs[k], expected.tgs[k])
 					}
 				}
 			}
@@ -1399,7 +1392,7 @@ func (o onceProvider) Run(_ context.Context, ch chan<- []*targetgroup.Group) {
 
 // TestTargetSetTargetGroupsUpdateDuringApplyConfig is used to detect races when
 // ApplyConfig happens at the same time as targets update.
-func TestTargetSetTargetGroupsUpdateDuringApplyConfig(t *testing.T) {
+func TestTargetSetTargetGroupsUpdateDuringApplyConfig(*testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 	discoveryManager := NewManager(ctx, log.NewNopLogger())

discovery/nomad/nomad.go

@@ -161,7 +161,7 @@ func NewDiscovery(conf *SDConfig, logger log.Logger) (*Discovery, error) {
 	return d, nil
 }
 
-func (d *Discovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
+func (d *Discovery) refresh(context.Context) ([]*targetgroup.Group, error) {
 	opts := &nomad.QueryOptions{
 		AllowStale: d.allowStale,
 	}

discovery/ovhcloud/dedicated_server.go

@@ -102,7 +102,7 @@ func (d *dedicatedServerDiscovery) getSource() string {
 	return fmt.Sprintf("%s_%s", d.config.Name(), d.getService())
 }
 
-func (d *dedicatedServerDiscovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
+func (d *dedicatedServerDiscovery) refresh(context.Context) ([]*targetgroup.Group, error) {
 	client, err := createClient(d.config)
 	if err != nil {
 		return nil, err

discovery/ovhcloud/vps.go

@@ -117,7 +117,7 @@ func (d *vpsDiscovery) getSource() string {
 	return fmt.Sprintf("%s_%s", d.config.Name(), d.getService())
 }
 
-func (d *vpsDiscovery) refresh(ctx context.Context) ([]*targetgroup.Group, error) {
+func (d *vpsDiscovery) refresh(context.Context) ([]*targetgroup.Group, error) {
 	client, err := createClient(d.config)
 	if err != nil {
 		return nil, 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

discovery/zookeeper/zookeeper.go

@@ -193,7 +193,7 @@ func (d *Discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
 		}
 		for _, pathUpdate := range d.pathUpdates {
 			// Drain event channel in case the treecache leaks goroutines otherwise.
-			for range pathUpdate {
+			for range pathUpdate { // nolint:revive
 			}
 		}
 		d.conn.Close()

model/textparse/promparse.go

@@ -238,9 +238,10 @@ func (p *PromParser) Metric(l *labels.Labels) string {
 	return s
 }
 
-// Exemplar writes the exemplar of the current sample into the passed
-// exemplar. It returns if an exemplar exists.
-func (p *PromParser) Exemplar(e *exemplar.Exemplar) bool {
+// Exemplar implements the Parser interface. However, since the classic
+// Prometheus text format does not support exemplars, this implementation simply
+// returns false and does nothing else.
+func (p *PromParser) Exemplar(*exemplar.Exemplar) bool {
 	return false
 }
 

promql/bench_test.go

@@ -27,7 +27,7 @@ import (
 	"github.com/prometheus/prometheus/util/teststorage"
 )
 
-func setupRangeQueryTestData(stor *teststorage.TestStorage, engine *Engine, interval, numIntervals int) error {
+func setupRangeQueryTestData(stor *teststorage.TestStorage, _ *Engine, interval, numIntervals int) error {
 	metrics := []labels.Labels{}
 	metrics = append(metrics, labels.FromStrings("__name__", "a_one"))
 	metrics = append(metrics, labels.FromStrings("__name__", "b_one"))

promql/engine.go

@@ -1957,7 +1957,7 @@ func (ev *evaluator) matrixIterSlice(
 		//   (b) the number of samples is relatively small.
 		// so a linear search will be as fast as a binary search.
 		var drop int
-		for drop = 0; floats[drop].T < mint; drop++ {
+		for drop = 0; floats[drop].T < mint; drop++ { // nolint:revive
 		}
 		ev.currentSamples -= drop
 		copy(floats, floats[drop:])

promql/functions.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// nolint:revive // Many unsued function arguments in this file by design.
 package promql
 
 import (

promql/parser/lex.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// nolint:revive // Many legitimately empty blocks in this file.
 package parser
 
 import (
@@ -293,7 +294,7 @@ func (l *Lexer) accept(valid string) bool {
 // acceptRun consumes a run of runes from the valid set.
 func (l *Lexer) acceptRun(valid string) {
 	for strings.ContainsRune(valid, l.next()) {
-		// consume
+		// Consume.
 	}
 	l.backup()
 }

promql/parser/parse.go

@@ -332,7 +332,7 @@ func (p *parser) Lex(lval *yySymType) int {
 // It is a no-op since the parsers error routines are triggered
 // by mechanisms that allow more fine-grained control
 // For more information, see https://pkg.go.dev/golang.org/x/tools/cmd/goyacc.
-func (p *parser) Error(e string) {
+func (p *parser) Error(string) {
 }
 
 // InjectItem allows injecting a single Item at the beginning of the token stream
@@ -481,9 +481,9 @@ func (p *parser) checkAST(node Node) (typ ValueType) {
 		// This is made a function instead of a variable, so it is lazily evaluated on demand.
 		opRange := func() (r PositionRange) {
 			// Remove whitespace at the beginning and end of the range.
-			for r.Start = n.LHS.PositionRange().End; isSpace(rune(p.lex.input[r.Start])); r.Start++ {
+			for r.Start = n.LHS.PositionRange().End; isSpace(rune(p.lex.input[r.Start])); r.Start++ { // nolint:revive
 			}
-			for r.End = n.RHS.PositionRange().Start - 1; isSpace(rune(p.lex.input[r.End])); r.End-- {
+			for r.End = n.RHS.PositionRange().Start - 1; isSpace(rune(p.lex.input[r.End])); r.End-- { // nolint:revive
 			}
 			return
 		}

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

@@ -779,13 +779,13 @@ func TestUpdate(t *testing.T) {
 			rgs.Groups[i].Interval = model.Duration(10)
 		}
 	}
-	reloadAndValidate(rgs, t, tmpFile, ruleManager, expected, ogs)
+	reloadAndValidate(rgs, t, tmpFile, ruleManager, ogs)
 
 	// Update limit and reload.
 	for i := range rgs.Groups {
 		rgs.Groups[i].Limit = 1
 	}
-	reloadAndValidate(rgs, t, tmpFile, ruleManager, expected, ogs)
+	reloadAndValidate(rgs, t, tmpFile, ruleManager, ogs)
 
 	// Change group rules and reload.
 	for i, g := range rgs.Groups {
@@ -793,7 +793,7 @@ func TestUpdate(t *testing.T) {
 			rgs.Groups[i].Rules[j].Expr.SetString(fmt.Sprintf("%s * 0", r.Expr.Value))
 		}
 	}
-	reloadAndValidate(rgs, t, tmpFile, ruleManager, expected, ogs)
+	reloadAndValidate(rgs, t, tmpFile, ruleManager, ogs)
 }
 
 // ruleGroupsTest for running tests over rules.
@@ -836,7 +836,7 @@ func formatRules(r *rulefmt.RuleGroups) ruleGroupsTest {
 	}
 }
 
-func reloadAndValidate(rgs *rulefmt.RuleGroups, t *testing.T, tmpFile *os.File, ruleManager *Manager, expected map[string]labels.Labels, ogs map[string]*Group) {
+func reloadAndValidate(rgs *rulefmt.RuleGroups, t *testing.T, tmpFile *os.File, ruleManager *Manager, ogs map[string]*Group) {
 	bs, err := yaml.Marshal(formatRules(rgs))
 	require.NoError(t, err)
 	tmpFile.Seek(0, 0)

rules/origin_test.go

@@ -30,19 +30,19 @@ type unknownRule struct{}
 
 func (u unknownRule) Name() string          { return "" }
 func (u unknownRule) Labels() labels.Labels { return labels.EmptyLabels() }
-func (u unknownRule) Eval(ctx context.Context, time time.Time, queryFunc QueryFunc, url *url.URL, i int) (promql.Vector, error) {
+func (u unknownRule) Eval(context.Context, time.Time, QueryFunc, *url.URL, int) (promql.Vector, error) {
 	return nil, nil
 }
-func (u unknownRule) String() string                               { return "" }
-func (u unknownRule) Query() parser.Expr                           { return nil }
-func (u unknownRule) SetLastError(err error)                       {}
-func (u unknownRule) LastError() error                             { return nil }
-func (u unknownRule) SetHealth(health RuleHealth)                  {}
-func (u unknownRule) Health() RuleHealth                           { return "" }
-func (u unknownRule) SetEvaluationDuration(duration time.Duration) {}
-func (u unknownRule) GetEvaluationDuration() time.Duration         { return 0 }
-func (u unknownRule) SetEvaluationTimestamp(time time.Time)        {}
-func (u unknownRule) GetEvaluationTimestamp() time.Time            { return time.Time{} }
+func (u unknownRule) String() string                       { return "" }
+func (u unknownRule) Query() parser.Expr                   { return nil }
+func (u unknownRule) SetLastError(error)                   {}
+func (u unknownRule) LastError() error                     { return nil }
+func (u unknownRule) SetHealth(RuleHealth)                 {}
+func (u unknownRule) Health() RuleHealth                   { return "" }
+func (u unknownRule) SetEvaluationDuration(time.Duration)  {}
+func (u unknownRule) GetEvaluationDuration() time.Duration { return 0 }
+func (u unknownRule) SetEvaluationTimestamp(time.Time)     {}
+func (u unknownRule) GetEvaluationTimestamp() time.Time    { return time.Time{} }
 
 func TestNewRuleDetailPanics(t *testing.T) {
 	require.PanicsWithValue(t, `unknown rule type "rules.unknownRule"`, func() {

scrape/scrape_test.go

@@ -2405,7 +2405,7 @@ type testScraper struct {
 	scrapeFunc func(context.Context, io.Writer) error
 }
 
-func (ts *testScraper) offset(interval time.Duration, jitterSeed uint64) time.Duration {
+func (ts *testScraper) offset(time.Duration, uint64) time.Duration {
 	return ts.offsetDur
 }
 
@@ -2867,7 +2867,7 @@ func TestScrapeAddFast(t *testing.T) {
 	require.NoError(t, slApp.Commit())
 }
 
-func TestReuseCacheRace(t *testing.T) {
+func TestReuseCacheRace(*testing.T) {
 	var (
 		app = &nopAppendable{}
 		cfg = &config.ScrapeConfig{

scrape/target_test.go

@@ -134,7 +134,7 @@ func TestTargetURL(t *testing.T) {
 	require.Equal(t, expectedURL, target.URL())
 }
 
-func newTestTarget(targetURL string, deadline time.Duration, lbls labels.Labels) *Target {
+func newTestTarget(targetURL string, _ time.Duration, lbls labels.Labels) *Target {
 	lb := labels.NewBuilder(lbls)
 	lb.Set(model.SchemeLabel, "http")
 	lb.Set(model.AddressLabel, strings.TrimPrefix(targetURL, "http://"))

storage/buffer_test.go

@@ -188,8 +188,8 @@ func BenchmarkBufferedSeriesIterator(b *testing.B) {
 	b.ReportAllocs()
 	b.ResetTimer()
 
-	for it.Next() != chunkenc.ValNone {
-		// scan everything
+	for it.Next() != chunkenc.ValNone { // nolint:revive
+		// Scan everything.
 	}
 	require.NoError(b, it.Err())
 }

storage/fanout_test.go

@@ -233,7 +233,7 @@ func (errQuerier) Select(bool, *storage.SelectHints, ...*labels.Matcher) storage
 	return storage.ErrSeriesSet(errSelect)
 }
 
-func (errQuerier) LabelValues(name string, matchers ...*labels.Matcher) ([]string, storage.Warnings, error) {
+func (errQuerier) LabelValues(string, ...*labels.Matcher) ([]string, storage.Warnings, error) {
 	return nil, nil, errors.New("label values error")
 }
 

storage/interface.go

@@ -99,7 +99,7 @@ type MockQueryable struct {
 	MockQuerier Querier
 }
 
-func (q *MockQueryable) Querier(ctx context.Context, mint, maxt int64) (Querier, error) {
+func (q *MockQueryable) Querier(context.Context, int64, int64) (Querier, error) {
 	return q.MockQuerier, nil
 }
 
@@ -118,11 +118,11 @@ type MockQuerier struct {
 	SelectMockFunction func(sortSeries bool, hints *SelectHints, matchers ...*labels.Matcher) SeriesSet
 }
 
-func (q *MockQuerier) LabelValues(name string, matchers ...*labels.Matcher) ([]string, Warnings, error) {
+func (q *MockQuerier) LabelValues(string, ...*labels.Matcher) ([]string, Warnings, error) {
 	return nil, nil, nil
 }
 
-func (q *MockQuerier) LabelNames(matchers ...*labels.Matcher) ([]string, Warnings, error) {
+func (q *MockQuerier) LabelNames(...*labels.Matcher) ([]string, Warnings, error) {
 	return nil, nil, nil
 }
 

storage/memoized_iterator_test.go

@@ -82,8 +82,8 @@ func BenchmarkMemoizedSeriesIterator(b *testing.B) {
 	b.ReportAllocs()
 	b.ResetTimer()
 
-	for it.Next() != chunkenc.ValNone {
-		// scan everything
+	for it.Next() != chunkenc.ValNone { // nolint:revive
+		// Scan everything.
 	}
 	require.NoError(b, it.Err())
 }

storage/merge.go

@@ -722,12 +722,11 @@ func (c *compactChunkIterator) Next() bool {
 			break
 		}
 
-		if next.MinTime == prev.MinTime &&
-			next.MaxTime == prev.MaxTime &&
-			bytes.Equal(next.Chunk.Bytes(), prev.Chunk.Bytes()) {
-			// 1:1 duplicates, skip it.
-		} else {
-			// We operate on same series, so labels does not matter here.
+		// Only do something if it is not a perfect duplicate.
+		if next.MinTime != prev.MinTime ||
+			next.MaxTime != prev.MaxTime ||
+			!bytes.Equal(next.Chunk.Bytes(), prev.Chunk.Bytes()) {
+			// We operate on same series, so labels do not matter here.
 			overlapping = append(overlapping, newChunkToSeriesDecoder(labels.EmptyLabels(), next))
 			if next.MaxTime > oMaxTime {
 				oMaxTime = next.MaxTime

storage/remote/codec_test.go

@@ -524,7 +524,7 @@ func TestDecodeWriteRequest(t *testing.T) {
 	require.Equal(t, writeRequestFixture, actual)
 }
 
-func TestNilHistogramProto(t *testing.T) {
+func TestNilHistogramProto(*testing.T) {
 	// This function will panic if it impromperly handles nil
 	// values, causing the test to fail.
 	HistogramProtoToHistogram(prompb.Histogram{})

storage/remote/queue_manager_test.go

@@ -362,7 +362,7 @@ func TestReshard(t *testing.T) {
 	c.waitForExpectedData(t)
 }
 
-func TestReshardRaceWithStop(t *testing.T) {
+func TestReshardRaceWithStop(*testing.T) {
 	c := NewTestWriteClient()
 	var m *QueueManager
 	h := sync.Mutex{}
@@ -864,10 +864,10 @@ func (c *TestBlockingWriteClient) Endpoint() string {
 // For benchmarking the send and not the receive side.
 type NopWriteClient struct{}
 
-func NewNopWriteClient() *NopWriteClient                            { return &NopWriteClient{} }
-func (c *NopWriteClient) Store(_ context.Context, req []byte) error { return nil }
-func (c *NopWriteClient) Name() string                              { return "nopwriteclient" }
-func (c *NopWriteClient) Endpoint() string                          { return "http://test-remote.com/1234" }
+func NewNopWriteClient() *NopWriteClient                      { return &NopWriteClient{} }
+func (c *NopWriteClient) Store(context.Context, []byte) error { return nil }
+func (c *NopWriteClient) Name() string                        { return "nopwriteclient" }
+func (c *NopWriteClient) Endpoint() string                    { return "http://test-remote.com/1234" }
 
 func BenchmarkSampleSend(b *testing.B) {
 	// Send one sample per series, which is the typical remote_write case

storage/remote/write_handler_test.go

@@ -294,7 +294,7 @@ func (m *mockAppendable) AppendExemplar(_ storage.SeriesRef, l labels.Labels, e
 	return 0, nil
 }
 
-func (m *mockAppendable) AppendHistogram(ref storage.SeriesRef, l labels.Labels, t int64, h *histogram.Histogram, fh *histogram.FloatHistogram) (storage.SeriesRef, error) {
+func (m *mockAppendable) AppendHistogram(_ storage.SeriesRef, l labels.Labels, t int64, h *histogram.Histogram, fh *histogram.FloatHistogram) (storage.SeriesRef, error) {
 	if t < m.latestHistogram {
 		return 0, storage.ErrOutOfOrderSample
 	}

tsdb/agent/db.go

@@ -732,22 +732,22 @@ func (db *DB) StartTime() (int64, error) {
 }
 
 // Querier implements the Storage interface.
-func (db *DB) Querier(ctx context.Context, mint, maxt int64) (storage.Querier, error) {
+func (db *DB) Querier(context.Context, int64, int64) (storage.Querier, error) {
 	return nil, ErrUnsupported
 }
 
 // ChunkQuerier implements the Storage interface.
-func (db *DB) ChunkQuerier(ctx context.Context, mint, maxt int64) (storage.ChunkQuerier, error) {
+func (db *DB) ChunkQuerier(context.Context, int64, int64) (storage.ChunkQuerier, error) {
 	return nil, ErrUnsupported
 }
 
 // ExemplarQuerier implements the Storage interface.
-func (db *DB) ExemplarQuerier(ctx context.Context) (storage.ExemplarQuerier, error) {
+func (db *DB) ExemplarQuerier(context.Context) (storage.ExemplarQuerier, error) {
 	return nil, ErrUnsupported
 }
 
 // Appender implements storage.Storage.
-func (db *DB) Appender(_ context.Context) storage.Appender {
+func (db *DB) Appender(context.Context) storage.Appender {
 	return db.appenderPool.Get().(storage.Appender)
 }
 
@@ -823,7 +823,7 @@ func (a *appender) Append(ref storage.SeriesRef, l labels.Labels, t int64, v flo
 		return 0, storage.ErrOutOfOrderSample
 	}
 
-	// NOTE: always modify pendingSamples and sampleSeries together
+	// NOTE: always modify pendingSamples and sampleSeries together.
 	a.pendingSamples = append(a.pendingSamples, record.RefSample{
 		Ref: series.ref,
 		T:   t,
@@ -849,8 +849,8 @@ func (a *appender) getOrCreate(l labels.Labels) (series *memSeries, created bool
 	return series, true
 }
 
-func (a *appender) AppendExemplar(ref storage.SeriesRef, l labels.Labels, e exemplar.Exemplar) (storage.SeriesRef, error) {
-	// series references and chunk references are identical for agent mode.
+func (a *appender) AppendExemplar(ref storage.SeriesRef, _ labels.Labels, e exemplar.Exemplar) (storage.SeriesRef, error) {
+	// Series references and chunk references are identical for agent mode.
 	headRef := chunks.HeadSeriesRef(ref)
 
 	s := a.series.GetByID(headRef)
@@ -973,7 +973,7 @@ func (a *appender) AppendHistogram(ref storage.SeriesRef, l labels.Labels, t int
 	return storage.SeriesRef(series.ref), nil
 }
 
-func (a *appender) UpdateMetadata(ref storage.SeriesRef, l labels.Labels, m metadata.Metadata) (storage.SeriesRef, error) {
+func (a *appender) UpdateMetadata(storage.SeriesRef, labels.Labels, metadata.Metadata) (storage.SeriesRef, error) {
 	// TODO: Wire metadata in the Agent's appender.
 	return 0, nil
 }

tsdb/chunkenc/float_histogram.go

@@ -107,7 +107,7 @@ func (c *FloatHistogramChunk) Appender() (Appender, error) {
 	// To get an appender, we must know the state it would have if we had
 	// appended all existing data from scratch. We iterate through the end
 	// and populate via the iterator's state.
-	for it.Next() == ValFloatHistogram {
+	for it.Next() == ValFloatHistogram { // nolint:revive
 	}
 	if err := it.Err(); err != nil {
 		return nil, err

tsdb/chunkenc/float_histogram_test.go

@@ -111,7 +111,7 @@ func TestFloatHistogramChunkSameBuckets(t *testing.T) {
 
 	// 3. Now recycle an iterator that was never used to access anything.
 	itX := c.Iterator(nil)
-	for itX.Next() == ValFloatHistogram {
+	for itX.Next() == ValFloatHistogram { // nolint:revive
 		// Just iterate through without accessing anything.
 	}
 	it3 := c.iterator(itX)

tsdb/chunkenc/histogram.go

@@ -126,7 +126,7 @@ func (c *HistogramChunk) Appender() (Appender, error) {
 	// To get an appender, we must know the state it would have if we had
 	// appended all existing data from scratch. We iterate through the end
 	// and populate via the iterator's state.
-	for it.Next() == ValHistogram {
+	for it.Next() == ValHistogram { // nolint:revive
 	}
 	if err := it.Err(); err != nil {
 		return nil, err

tsdb/chunkenc/histogram_test.go

@@ -116,7 +116,7 @@ func TestHistogramChunkSameBuckets(t *testing.T) {
 
 	// 3. Now recycle an iterator that was never used to access anything.
 	itX := c.Iterator(nil)
-	for itX.Next() == ValHistogram {
+	for itX.Next() == ValHistogram { // nolint:revive
 		// Just iterate through without accessing anything.
 	}
 	it3 := c.iterator(itX)

tsdb/chunkenc/xor.go

@@ -99,7 +99,7 @@ func (c *XORChunk) Appender() (Appender, error) {
 	// To get an appender we must know the state it would have if we had
 	// appended all existing data from scratch.
 	// We iterate through the end and populate via the iterator's state.
-	for it.Next() != ValNone {
+	for it.Next() != ValNone { // nolint:revive
 	}
 	if err := it.Err(); err != nil {
 		return nil, err
@@ -152,11 +152,11 @@ type xorAppender struct {
 	trailing uint8
 }
 
-func (a *xorAppender) AppendHistogram(t int64, h *histogram.Histogram) {
+func (a *xorAppender) AppendHistogram(int64, *histogram.Histogram) {
 	panic("appended a histogram to an xor chunk")
 }
 
-func (a *xorAppender) AppendFloatHistogram(t int64, h *histogram.FloatHistogram) {
+func (a *xorAppender) AppendFloatHistogram(int64, *histogram.FloatHistogram) {
 	panic("appended a float histogram to an xor chunk")
 }
 

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_test.go

@@ -467,8 +467,8 @@ func (erringBReader) Size() int64                            { return 0 }
 
 type nopChunkWriter struct{}
 
-func (nopChunkWriter) WriteChunks(chunks ...chunks.Meta) error { return nil }
-func (nopChunkWriter) Close() error                            { return nil }
+func (nopChunkWriter) WriteChunks(...chunks.Meta) error { return nil }
+func (nopChunkWriter) Close() error                     { return nil }
 
 func samplesForRange(minTime, maxTime int64, maxSamplesPerChunk int) (ret [][]sample) {
 	var curr []sample

tsdb/db_test.go

@@ -1426,11 +1426,11 @@ type mockCompactorFailing struct {
 	max    int
 }
 
-func (*mockCompactorFailing) Plan(dir string) ([]string, error) {
+func (*mockCompactorFailing) Plan(string) ([]string, error) {
 	return nil, nil
 }
 
-func (c *mockCompactorFailing) Write(dest string, b BlockReader, mint, maxt int64, parent *BlockMeta) (ulid.ULID, error) {
+func (c *mockCompactorFailing) Write(dest string, _ BlockReader, _, _ int64, _ *BlockMeta) (ulid.ULID, error) {
 	if len(c.blocks) >= c.max {
 		return ulid.ULID{}, fmt.Errorf("the compactor already did the maximum allowed blocks so it is time to fail")
 	}
@@ -1458,7 +1458,7 @@ func (*mockCompactorFailing) Compact(string, []string, []*Block) (ulid.ULID, err
 	return ulid.ULID{}, nil
 }
 
-func (*mockCompactorFailing) CompactOOO(dest string, oooHead *OOOCompactionHead) (result []ulid.ULID, err error) {
+func (*mockCompactorFailing) CompactOOO(string, *OOOCompactionHead) (result []ulid.ULID, err error) {
 	return nil, fmt.Errorf("mock compaction failing CompactOOO")
 }
 

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) {
-	if len < 0 {
-		len = 0
+func NewCircularExemplarStorage(length int64, m *ExemplarMetrics) (ExemplarStorage, error) {
+	if length < 0 {
+		length = 0
 	}
 	c := &CircularExemplarStorage{
-		exemplars: make([]*circularBufferEntry, len),
-		index:     make(map[string]*indexEntry, len/estimatedExemplarsPerSeries),
+		exemplars: make([]*circularBufferEntry, length),
+		index:     make(map[string]*indexEntry, length/estimatedExemplarsPerSeries),
 		metrics:   m,
 	}
 
-	c.metrics.maxExemplars.Set(float64(len))
+	c.metrics.maxExemplars.Set(float64(length))
 
 	return c, nil
 }

tsdb/goversion/goversion_test.go

@@ -24,4 +24,4 @@ import (
 //
 // The blank import above is actually what invokes the test of this package. If
 // the import succeeds (the code compiles), the test passed.
-func Test(t *testing.T) {}
+func Test(*testing.T) {}

tsdb/head_test.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// nolint:revive // Many legitimately empty blocks in this file.
 package tsdb
 
 import (
@@ -103,7 +104,7 @@ func BenchmarkHeadAppender_Append_Commit_ExistingSeries(b *testing.B) {
 					b.Cleanup(func() { require.NoError(b, h.Close()) })
 
 					ts := int64(1000)
-					append := func() error {
+					appendSamples := func() error {
 						var err error
 						app := h.Appender(context.Background())
 						for _, s := range series[:seriesCount] {
@@ -120,13 +121,13 @@ func BenchmarkHeadAppender_Append_Commit_ExistingSeries(b *testing.B) {
 					}
 
 					// Init series, that's not what we're benchmarking here.
-					require.NoError(b, append())
+					require.NoError(b, appendSamples())
 
 					b.ReportAllocs()
 					b.ResetTimer()
 
 					for i := 0; i < b.N; i++ {
-						require.NoError(b, append())
+						require.NoError(b, appendSamples())
 					}
 				})
 			}

tsdb/head_wal.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// nolint:revive // Many legitimately empty blocks in this file.
 package tsdb
 
 import (

tsdb/ooo_head_read.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// nolint:revive // Many unsued function arguments in this file by design.
 package tsdb
 
 import (

tsdb/querier.go

@@ -1085,7 +1085,7 @@ func newNopChunkReader() ChunkReader {
 	}
 }
 
-func (cr nopChunkReader) Chunk(meta chunks.Meta) (chunkenc.Chunk, error) {
+func (cr nopChunkReader) Chunk(chunks.Meta) (chunkenc.Chunk, error) {
 	return cr.emptyChunk, nil
 }
 

tsdb/querier_bench_test.go

@@ -250,7 +250,7 @@ func BenchmarkQuerierSelect(b *testing.B) {
 				b.ResetTimer()
 				for i := 0; i < b.N; i++ {
 					ss := q.Select(sorted, nil, matcher)
-					for ss.Next() {
+					for ss.Next() { // nolint:revive
 					}
 					require.NoError(b, ss.Err())
 				}

tsdb/querier_test.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// nolint:revive // Many unsued function arguments in this file by design.
 package tsdb
 
 import (

tsdb/wal.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// nolint:revive // Many unsued function arguments in this file by design.
 package tsdb
 
 import (

tsdb/wlog/reader_test.go

@@ -533,7 +533,7 @@ func TestReaderData(t *testing.T) {
 			require.NoError(t, err)
 
 			reader := fn(sr)
-			for reader.Next() {
+			for reader.Next() { // nolint:revive
 			}
 			require.NoError(t, reader.Err())
 

tsdb/wlog/wlog_test.go

@@ -164,7 +164,7 @@ func TestWALRepair_ReadingError(t *testing.T) {
 				sr := NewSegmentBufReader(s)
 				require.NoError(t, err)
 				r := NewReader(sr)
-				for r.Next() {
+				for r.Next() { // nolint:revive
 				}
 
 				// Close the segment so we don't break things on Windows.

util/logging/dedupe_test.go

@@ -22,7 +22,7 @@ import (
 
 type counter int
 
-func (c *counter) Log(keyvals ...interface{}) error {
+func (c *counter) Log(...interface{}) error {
 	(*c)++
 	return nil
 }

util/testutil/context.go

@@ -37,6 +37,6 @@ func (c *MockContext) Err() error {
 }
 
 // Value ignores the Value and always returns nil
-func (c *MockContext) Value(key interface{}) interface{} {
+func (c *MockContext) Value(interface{}) interface{} {
 	return nil
 }

util/testutil/roundtrip.go

@@ -22,7 +22,7 @@ type roundTrip struct {
 	theError    error
 }
 
-func (rt *roundTrip) RoundTrip(r *http.Request) (*http.Response, error) {
+func (rt *roundTrip) RoundTrip(*http.Request) (*http.Response, error) {
 	return rt.theResponse, rt.theError
 }
 

util/treecache/treecache.go

@@ -116,7 +116,7 @@ func (tc *ZookeeperTreeCache) Stop() {
 	tc.stop <- struct{}{}
 	go func() {
 		// Drain tc.head.events so that go routines can make progress and exit.
-		for range tc.head.events {
+		for range tc.head.events { // nolint:revive
 		}
 	}()
 	go func() {

web/api/v1/api.go

@@ -117,7 +117,7 @@ type RulesRetriever interface {
 
 type StatsRenderer func(context.Context, *stats.Statistics, string) stats.QueryStats
 
-func defaultStatsRenderer(ctx context.Context, s *stats.Statistics, param string) stats.QueryStats {
+func defaultStatsRenderer(_ context.Context, s *stats.Statistics, param string) stats.QueryStats {
 	if param != "" {
 		return stats.NewQueryStats(s)
 	}
@@ -392,7 +392,7 @@ func invalidParamError(err error, parameter string) apiFuncResult {
 	}, nil, nil}
 }
 
-func (api *API) options(r *http.Request) apiFuncResult {
+func (api *API) options(*http.Request) apiFuncResult {
 	return apiFuncResult{nil, nil, nil, nil}
 }
 
@@ -1565,7 +1565,7 @@ func (api *API) snapshot(r *http.Request) apiFuncResult {
 	}{name}, nil, nil, nil}
 }
 
-func (api *API) cleanTombstones(r *http.Request) apiFuncResult {
+func (api *API) cleanTombstones(*http.Request) apiFuncResult {
 	if !api.enableAdmin {
 		return apiFuncResult{nil, &apiError{errorUnavailable, errors.New("admin APIs disabled")}, nil, nil}
 	}
@@ -1764,7 +1764,7 @@ func marshalSeriesJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 	stream.WriteObjectEnd()
 }
 
-func marshalSeriesJSONIsEmpty(ptr unsafe.Pointer) bool {
+func marshalSeriesJSONIsEmpty(unsafe.Pointer) bool {
 	return false
 }
 
@@ -1817,7 +1817,7 @@ func marshalSampleJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 	stream.WriteObjectEnd()
 }
 
-func marshalSampleJSONIsEmpty(ptr unsafe.Pointer) bool {
+func marshalSampleJSONIsEmpty(unsafe.Pointer) bool {
 	return false
 }
 
@@ -1841,7 +1841,7 @@ func marshalHPointJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 	stream.WriteArrayEnd()
 }
 
-func marshalPointJSONIsEmpty(ptr unsafe.Pointer) bool {
+func marshalPointJSONIsEmpty(unsafe.Pointer) bool {
 	return false
 }
 
@@ -1878,6 +1878,6 @@ func marshalExemplarJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
 	stream.WriteObjectEnd()
 }
 
-func marshalExemplarJSONEmpty(ptr unsafe.Pointer) bool {
+func marshalExemplarJSONEmpty(unsafe.Pointer) bool {
 	return false
 }

web/api/v1/api_test.go

@@ -2560,9 +2560,9 @@ type fakeDB struct {
 	err error
 }
 
-func (f *fakeDB) CleanTombstones() error                               { return f.err }
-func (f *fakeDB) Delete(mint, maxt int64, ms ...*labels.Matcher) error { return f.err }
-func (f *fakeDB) Snapshot(dir string, withHead bool) error             { return f.err }
+func (f *fakeDB) CleanTombstones() error                        { return f.err }
+func (f *fakeDB) Delete(int64, int64, ...*labels.Matcher) error { return f.err }
+func (f *fakeDB) Snapshot(string, bool) error                   { return f.err }
 func (f *fakeDB) Stats(statsByLabelName string) (_ *tsdb.Stats, retErr error) {
 	dbDir, err := os.MkdirTemp("", "tsdb-api-ready")
 	if err != nil {

web/api/v1/errors_test.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// nolint:revive // Many unsued function arguments in this file by design.
 package v1
 
 import (

web/web.go

@@ -755,14 +755,14 @@ func toFloat64(f *io_prometheus_client.MetricFamily) float64 {
 	return math.NaN()
 }
 
-func (h *Handler) version(w http.ResponseWriter, r *http.Request) {
+func (h *Handler) version(w http.ResponseWriter, _ *http.Request) {
 	dec := json.NewEncoder(w)
 	if err := dec.Encode(h.versionInfo); err != nil {
 		http.Error(w, fmt.Sprintf("error encoding JSON: %s", err), http.StatusInternalServerError)
 	}
 }
 
-func (h *Handler) quit(w http.ResponseWriter, r *http.Request) {
+func (h *Handler) quit(w http.ResponseWriter, _ *http.Request) {
 	var closed bool
 	h.quitOnce.Do(func() {
 		closed = true
@@ -774,7 +774,7 @@ func (h *Handler) quit(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-func (h *Handler) reload(w http.ResponseWriter, r *http.Request) {
+func (h *Handler) reload(w http.ResponseWriter, _ *http.Request) {
 	rc := make(chan error)
 	h.reloadCh <- rc
 	if err := <-rc; err != nil {