enable errorf rule from perfsprint linter

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

.golangci.yml

@@ -109,7 +109,7 @@ linters-settings:
     extra-rules: true
   perfsprint:
      # Optimizes `fmt.Errorf`.
-    errorf: false
+    errorf: true
   revive:
     # By default, revive will enable only the linting rules that are named in the configuration file.
     # So, it's needed to explicitly enable all required rules here.

cmd/promtool/analyze.go

@@ -34,8 +34,8 @@ import (
 )
 
 var (
-	errNotNativeHistogram = fmt.Errorf("not a native histogram")
-	errNotEnoughData      = fmt.Errorf("not enough data")
+	errNotNativeHistogram = errors.New("not a native histogram")
+	errNotEnoughData      = errors.New("not enough data")
 
 	outputHeader = `Bucket stats for each histogram series over time
 ------------------------------------------------
@@ -169,7 +169,7 @@ func querySamples(ctx context.Context, api v1.API, query string, end time.Time)
 
 	matrix, ok := values.(model.Matrix)
 	if !ok {
-		return nil, fmt.Errorf("query of buckets resulted in non-Matrix")
+		return nil, errors.New("query of buckets resulted in non-Matrix")
 	}
 
 	return matrix, nil
@@ -259,7 +259,7 @@ func getBucketCountsAtTime(matrix model.Matrix, numBuckets, timeIdx int) ([]int,
 		prev := matrix[i].Values[timeIdx]
 		// Assume the results are nicely aligned.
 		if curr.Timestamp != prev.Timestamp {
-			return counts, fmt.Errorf("matrix result is not time aligned")
+			return counts, errors.New("matrix result is not time aligned")
 		}
 		counts[i+1] = int(curr.Value - prev.Value)
 	}

cmd/promtool/backfill.go

@@ -49,7 +49,7 @@ func getMinAndMaxTimestamps(p textparse.Parser) (int64, int64, error) {
 
 		_, ts, _ := p.Series()
 		if ts == nil {
-			return 0, 0, fmt.Errorf("expected timestamp for series got none")
+			return 0, 0, errors.New("expected timestamp for series got none")
 		}
 
 		if *ts > maxt {

cmd/promtool/main.go

@@ -444,7 +444,7 @@ func checkExperimental(f bool) {
 	}
 }
 
-var errLint = fmt.Errorf("lint error")
+var errLint = errors.New("lint error")
 
 type lintConfig struct {
 	all            bool

cmd/promtool/tsdb.go

@@ -662,7 +662,7 @@ func analyzeCompaction(ctx context.Context, block tsdb.BlockReader, indexr tsdb.
 				histogramChunkSize = append(histogramChunkSize, len(chk.Bytes()))
 				fhchk, ok := chk.(*chunkenc.FloatHistogramChunk)
 				if !ok {
-					return fmt.Errorf("chunk is not FloatHistogramChunk")
+					return errors.New("chunk is not FloatHistogramChunk")
 				}
 				it := fhchk.Iterator(nil)
 				bucketCount := 0
@@ -677,7 +677,7 @@ func analyzeCompaction(ctx context.Context, block tsdb.BlockReader, indexr tsdb.
 				histogramChunkSize = append(histogramChunkSize, len(chk.Bytes()))
 				hchk, ok := chk.(*chunkenc.HistogramChunk)
 				if !ok {
-					return fmt.Errorf("chunk is not HistogramChunk")
+					return errors.New("chunk is not HistogramChunk")
 				}
 				it := hchk.Iterator(nil)
 				bucketCount := 0

config/config.go

@@ -1072,7 +1072,7 @@ func (c *AlertmanagerConfig) UnmarshalYAML(unmarshal func(interface{}) error) er
 		c.HTTPClientConfig.Authorization != nil || c.HTTPClientConfig.OAuth2 != nil
 
 	if httpClientConfigAuthEnabled && c.SigV4Config != nil {
-		return fmt.Errorf("at most one of basic_auth, authorization, oauth2, & sigv4 must be configured")
+		return errors.New("at most one of basic_auth, authorization, oauth2, & sigv4 must be configured")
 	}
 
 	// Check for users putting URLs in target groups.
@@ -1420,7 +1420,7 @@ func (c *OTLPConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	for i, attr := range c.PromoteResourceAttributes {
 		attr = strings.TrimSpace(attr)
 		if attr == "" {
-			err = errors.Join(err, fmt.Errorf("empty promoted OTel resource attribute"))
+			err = errors.Join(err, errors.New("empty promoted OTel resource attribute"))
 			continue
 		}
 		if _, exists := seen[attr]; exists {

discovery/aws/ec2.go

@@ -161,7 +161,7 @@ type EC2Discovery struct {
 func NewEC2Discovery(conf *EC2SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*EC2Discovery, error) {
 	m, ok := metrics.(*ec2Metrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	if logger == nil {

discovery/aws/lightsail.go

@@ -134,7 +134,7 @@ type LightsailDiscovery struct {
 func NewLightsailDiscovery(conf *LightsailSDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*LightsailDiscovery, error) {
 	m, ok := metrics.(*lightsailMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	if logger == nil {

discovery/azure/azure.go

@@ -186,7 +186,7 @@ type Discovery struct {
 func NewDiscovery(cfg *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*azureMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	if logger == nil {

discovery/consul/consul.go

@@ -189,7 +189,7 @@ type Discovery struct {
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*consulMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	if logger == nil {

discovery/digitalocean/digitalocean.go

@@ -15,6 +15,7 @@ package digitalocean
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"log/slog"
 	"net"
@@ -114,7 +115,7 @@ type Discovery struct {
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*digitaloceanMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	d := &Discovery{

discovery/dns/dns.go

@@ -121,7 +121,7 @@ type Discovery struct {
 func NewDiscovery(conf SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*dnsMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	if logger == nil {

discovery/dns/dns_test.go

@@ -15,7 +15,7 @@ package dns
 
 import (
 	"context"
-	"fmt"
+	"errors"
 	"log/slog"
 	"net"
 	"testing"
@@ -53,7 +53,7 @@ func TestDNS(t *testing.T) {
 				Type:            "A",
 			},
 			lookup: func(name string, qtype uint16, logger *slog.Logger) (*dns.Msg, error) {
-				return nil, fmt.Errorf("some error")
+				return nil, errors.New("some error")
 			},
 			expected: []*targetgroup.Group{},
 		},

discovery/eureka/eureka.go

@@ -16,7 +16,6 @@ package eureka
 import (
 	"context"
 	"errors"
-	"fmt"
 	"log/slog"
 	"net"
 	"net/http"
@@ -129,7 +128,7 @@ type Discovery struct {
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*eurekaMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	rt, err := config.NewRoundTripperFromConfig(conf.HTTPClientConfig, "eureka_sd")

discovery/file/file.go

@@ -184,7 +184,7 @@ type Discovery struct {
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	fm, ok := metrics.(*fileMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	if logger == nil {

discovery/gce/gce.go

@@ -132,7 +132,7 @@ type Discovery struct {
 func NewDiscovery(conf SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*gceMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	d := &Discovery{

discovery/hetzner/hetzner.go

@@ -138,7 +138,7 @@ type Discovery struct {
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*refresh.Discovery, error) {
 	m, ok := metrics.(*hetznerMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	r, err := newRefresher(conf, logger)

discovery/http/http.go

@@ -86,17 +86,17 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		return err
 	}
 	if c.URL == "" {
-		return fmt.Errorf("URL is missing")
+		return errors.New("URL is missing")
 	}
 	parsedURL, err := url.Parse(c.URL)
 	if err != nil {
 		return err
 	}
 	if parsedURL.Scheme != "http" && parsedURL.Scheme != "https" {
-		return fmt.Errorf("URL scheme must be 'http' or 'https'")
+		return errors.New("URL scheme must be 'http' or 'https'")
 	}
 	if parsedURL.Host == "" {
-		return fmt.Errorf("host is missing in URL")
+		return errors.New("host is missing in URL")
 	}
 	return c.HTTPClientConfig.Validate()
 }
@@ -118,7 +118,7 @@ type Discovery struct {
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, clientOpts []config.HTTPClientOption, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*httpMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	if logger == nil {

discovery/ionos/ionos.go

@@ -15,7 +15,6 @@ package ionos
 
 import (
 	"errors"
-	"fmt"
 	"log/slog"
 	"time"
 
@@ -46,7 +45,7 @@ type Discovery struct{}
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*refresh.Discovery, error) {
 	m, ok := metrics.(*ionosMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	if conf.ionosEndpoint == "" {

discovery/kubernetes/kubernetes.go

@@ -173,7 +173,7 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		return err
 	}
 	if c.Role == "" {
-		return fmt.Errorf("role missing (one of: pod, service, endpoints, endpointslice, node, ingress)")
+		return errors.New("role missing (one of: pod, service, endpoints, endpointslice, node, ingress)")
 	}
 	err = c.HTTPClientConfig.Validate()
 	if err != nil {
@@ -181,20 +181,20 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	}
 	if c.APIServer.URL != nil && c.KubeConfig != "" {
 		// Api-server and kubeconfig_file are mutually exclusive
-		return fmt.Errorf("cannot use 'kubeconfig_file' and 'api_server' simultaneously")
+		return errors.New("cannot use 'kubeconfig_file' and 'api_server' simultaneously")
 	}
 	if c.KubeConfig != "" && !reflect.DeepEqual(c.HTTPClientConfig, config.DefaultHTTPClientConfig) {
 		// Kubeconfig_file and custom http config are mutually exclusive
-		return fmt.Errorf("cannot use a custom HTTP client configuration together with 'kubeconfig_file'")
+		return errors.New("cannot use a custom HTTP client configuration together with 'kubeconfig_file'")
 	}
 	if c.APIServer.URL == nil && !reflect.DeepEqual(c.HTTPClientConfig, config.DefaultHTTPClientConfig) {
-		return fmt.Errorf("to use custom HTTP client configuration please provide the 'api_server' URL explicitly")
+		return errors.New("to use custom HTTP client configuration please provide the 'api_server' URL explicitly")
 	}
 	if c.APIServer.URL != nil && c.NamespaceDiscovery.IncludeOwnNamespace {
-		return fmt.Errorf("cannot use 'api_server' and 'namespaces.own_namespace' simultaneously")
+		return errors.New("cannot use 'api_server' and 'namespaces.own_namespace' simultaneously")
 	}
 	if c.KubeConfig != "" && c.NamespaceDiscovery.IncludeOwnNamespace {
-		return fmt.Errorf("cannot use 'kubeconfig_file' and 'namespaces.own_namespace' simultaneously")
+		return errors.New("cannot use 'kubeconfig_file' and 'namespaces.own_namespace' simultaneously")
 	}
 
 	foundSelectorRoles := make(map[Role]struct{})
@@ -288,7 +288,7 @@ func (d *Discovery) getNamespaces() []string {
 func New(l *slog.Logger, metrics discovery.DiscovererMetrics, conf *SDConfig) (*Discovery, error) {
 	m, ok := metrics.(*kubernetesMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	if l == nil {
@@ -672,7 +672,7 @@ func (d *Discovery) newPodsByNodeInformer(plw *cache.ListWatch) cache.SharedInde
 		indexers[nodeIndex] = func(obj interface{}) ([]string, error) {
 			pod, ok := obj.(*apiv1.Pod)
 			if !ok {
-				return nil, fmt.Errorf("object is not a pod")
+				return nil, errors.New("object is not a pod")
 			}
 			return []string{pod.Spec.NodeName}, nil
 		}
@@ -686,7 +686,7 @@ func (d *Discovery) newEndpointsByNodeInformer(plw *cache.ListWatch) cache.Share
 	indexers[podIndex] = func(obj interface{}) ([]string, error) {
 		e, ok := obj.(*apiv1.Endpoints)
 		if !ok {
-			return nil, fmt.Errorf("object is not endpoints")
+			return nil, errors.New("object is not endpoints")
 		}
 		var pods []string
 		for _, target := range e.Subsets {
@@ -705,7 +705,7 @@ func (d *Discovery) newEndpointsByNodeInformer(plw *cache.ListWatch) cache.Share
 	indexers[nodeIndex] = func(obj interface{}) ([]string, error) {
 		e, ok := obj.(*apiv1.Endpoints)
 		if !ok {
-			return nil, fmt.Errorf("object is not endpoints")
+			return nil, errors.New("object is not endpoints")
 		}
 		var nodes []string
 		for _, target := range e.Subsets {
@@ -751,7 +751,7 @@ func (d *Discovery) newEndpointSlicesByNodeInformer(plw *cache.ListWatch, object
 				}
 			}
 		default:
-			return nil, fmt.Errorf("object is not an endpointslice")
+			return nil, errors.New("object is not an endpointslice")
 		}
 
 		return nodes, nil

discovery/linode/linode.go

@@ -141,7 +141,7 @@ type Discovery struct {
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*linodeMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	d := &Discovery{

discovery/manager_test.go

@@ -15,6 +15,7 @@ package discovery
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"sort"
 	"strconv"
@@ -1209,9 +1210,9 @@ func TestGaugeFailedConfigs(t *testing.T) {
 
 	c := map[string]Configs{
 		"prometheus": {
-			errorConfig{fmt.Errorf("tests error 0")},
-			errorConfig{fmt.Errorf("tests error 1")},
-			errorConfig{fmt.Errorf("tests error 2")},
+			errorConfig{errors.New("tests error 0")},
+			errorConfig{errors.New("tests error 1")},
+			errorConfig{errors.New("tests error 2")},
 		},
 	}
 	discoveryManager.ApplyConfig(c)

discovery/marathon/marathon.go

@@ -143,7 +143,7 @@ type Discovery struct {
 func NewDiscovery(conf SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*marathonMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	rt, err := config.NewRoundTripperFromConfig(conf.HTTPClientConfig, "marathon_sd")

discovery/moby/docker.go

@@ -15,6 +15,7 @@ package moby
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"log/slog"
 	"net"
@@ -110,7 +111,7 @@ func (c *DockerSDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error
 		return err
 	}
 	if c.Host == "" {
-		return fmt.Errorf("host missing")
+		return errors.New("host missing")
 	}
 	if _, err = url.Parse(c.Host); err != nil {
 		return err
@@ -131,7 +132,7 @@ type DockerDiscovery struct {
 func NewDockerDiscovery(conf *DockerSDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*DockerDiscovery, error) {
 	m, ok := metrics.(*dockerMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	d := &DockerDiscovery{

discovery/moby/dockerswarm.go

@@ -15,6 +15,7 @@ package moby
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"log/slog"
 	"net/http"
@@ -99,7 +100,7 @@ func (c *DockerSwarmSDConfig) UnmarshalYAML(unmarshal func(interface{}) error) e
 		return err
 	}
 	if c.Host == "" {
-		return fmt.Errorf("host missing")
+		return errors.New("host missing")
 	}
 	if _, err = url.Parse(c.Host); err != nil {
 		return err
@@ -107,7 +108,7 @@ func (c *DockerSwarmSDConfig) UnmarshalYAML(unmarshal func(interface{}) error) e
 	switch c.Role {
 	case "services", "nodes", "tasks":
 	case "":
-		return fmt.Errorf("role missing (one of: tasks, services, nodes)")
+		return errors.New("role missing (one of: tasks, services, nodes)")
 	default:
 		return fmt.Errorf("invalid role %s, expected tasks, services, or nodes", c.Role)
 	}
@@ -128,7 +129,7 @@ type Discovery struct {
 func NewDiscovery(conf *DockerSwarmSDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*dockerswarmMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	d := &Discovery{

discovery/nomad/nomad.go

@@ -124,7 +124,7 @@ type Discovery struct {
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*nomadMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	d := &Discovery{

discovery/openstack/openstack.go

@@ -145,7 +145,7 @@ type refresher interface {
 func NewDiscovery(conf *SDConfig, l *slog.Logger, metrics discovery.DiscovererMetrics) (*refresh.Discovery, error) {
 	m, ok := metrics.(*openstackMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	r, err := newRefresher(conf, l)

discovery/ovhcloud/ovhcloud.go

@@ -151,7 +151,7 @@ func newRefresher(conf *SDConfig, logger *slog.Logger) (refresher, error) {
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*refresh.Discovery, error) {
 	m, ok := metrics.(*ovhcloudMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	r, err := newRefresher(conf, logger)

discovery/puppetdb/puppetdb.go

@@ -17,6 +17,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"log/slog"
@@ -109,20 +110,20 @@ func (c *SDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		return err
 	}
 	if c.URL == "" {
-		return fmt.Errorf("URL is missing")
+		return errors.New("URL is missing")
 	}
 	parsedURL, err := url.Parse(c.URL)
 	if err != nil {
 		return err
 	}
 	if parsedURL.Scheme != "http" && parsedURL.Scheme != "https" {
-		return fmt.Errorf("URL scheme must be 'http' or 'https'")
+		return errors.New("URL scheme must be 'http' or 'https'")
 	}
 	if parsedURL.Host == "" {
-		return fmt.Errorf("host is missing in URL")
+		return errors.New("host is missing in URL")
 	}
 	if c.Query == "" {
-		return fmt.Errorf("query missing")
+		return errors.New("query missing")
 	}
 	return c.HTTPClientConfig.Validate()
 }
@@ -142,7 +143,7 @@ type Discovery struct {
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*puppetdbMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	if logger == nil {

discovery/refresh/refresh_test.go

@@ -15,7 +15,7 @@ package refresh
 
 import (
 	"context"
-	"fmt"
+	"errors"
 	"testing"
 	"time"
 
@@ -64,7 +64,7 @@ func TestRefresh(t *testing.T) {
 		case 2:
 			return tg2, nil
 		}
-		return nil, fmt.Errorf("some error")
+		return nil, errors.New("some error")
 	}
 	interval := time.Millisecond
 

discovery/registry.go

@@ -267,7 +267,7 @@ func replaceYAMLTypeError(err error, oldTyp, newTyp reflect.Type) error {
 func RegisterSDMetrics(registerer prometheus.Registerer, rmm RefreshMetricsManager) (map[string]DiscovererMetrics, error) {
 	err := rmm.Register()
 	if err != nil {
-		return nil, fmt.Errorf("failed to create service discovery refresh metrics")
+		return nil, errors.New("failed to create service discovery refresh metrics")
 	}
 
 	metrics := make(map[string]DiscovererMetrics)
@@ -275,7 +275,7 @@ func RegisterSDMetrics(registerer prometheus.Registerer, rmm RefreshMetricsManag
 		currentSdMetrics := conf.NewDiscovererMetrics(registerer, rmm)
 		err = currentSdMetrics.Register()
 		if err != nil {
-			return nil, fmt.Errorf("failed to create service discovery metrics")
+			return nil, errors.New("failed to create service discovery metrics")
 		}
 		metrics[conf.Name()] = currentSdMetrics
 	}

discovery/scaleway/scaleway.go

@@ -188,7 +188,7 @@ type Discovery struct{}
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*refresh.Discovery, error) {
 	m, ok := metrics.(*scalewayMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	r, err := newRefresher(conf)

discovery/triton/triton.go

@@ -149,7 +149,7 @@ type Discovery struct {
 func New(logger *slog.Logger, conf *SDConfig, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*tritonMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	tls, err := config.NewTLSConfig(&conf.TLSConfig)

discovery/uyuni/uyuni.go

@@ -215,7 +215,7 @@ func getEndpointInfoForSystems(
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*uyuniMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	apiURL, err := url.Parse(conf.Server)

discovery/vultr/vultr.go

@@ -15,6 +15,7 @@ package vultr
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"log/slog"
 	"net"
@@ -117,7 +118,7 @@ type Discovery struct {
 func NewDiscovery(conf *SDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (*Discovery, error) {
 	m, ok := metrics.(*vultrMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	d := &Discovery{

discovery/xds/kuma.go

@@ -14,6 +14,7 @@
 package xds
 
 import (
+	"errors"
 	"fmt"
 	"log/slog"
 	"net/url"
@@ -161,7 +162,7 @@ func kumaMadsV1ResourceParser(resources []*anypb.Any, typeURL string) ([]model.L
 func NewKumaHTTPDiscovery(conf *KumaSDConfig, logger *slog.Logger, metrics discovery.DiscovererMetrics) (discovery.Discoverer, error) {
 	m, ok := metrics.(*xdsMetrics)
 	if !ok {
-		return nil, fmt.Errorf("invalid discovery metrics type")
+		return nil, errors.New("invalid discovery metrics type")
 	}
 
 	// Default to "prometheus" if hostname is unavailable.

model/histogram/float_histogram.go

@@ -14,6 +14,7 @@
 package histogram
 
 import (
+	"errors"
 	"fmt"
 	"math"
 	"strings"
@@ -784,16 +785,16 @@ func (h *FloatHistogram) Validate() error {
 			return fmt.Errorf("custom buckets: %w", err)
 		}
 		if h.ZeroCount != 0 {
-			return fmt.Errorf("custom buckets: must have zero count of 0")
+			return errors.New("custom buckets: must have zero count of 0")
 		}
 		if h.ZeroThreshold != 0 {
-			return fmt.Errorf("custom buckets: must have zero threshold of 0")
+			return errors.New("custom buckets: must have zero threshold of 0")
 		}
 		if len(h.NegativeSpans) > 0 {
-			return fmt.Errorf("custom buckets: must not have negative spans")
+			return errors.New("custom buckets: must not have negative spans")
 		}
 		if len(h.NegativeBuckets) > 0 {
-			return fmt.Errorf("custom buckets: must not have negative buckets")
+			return errors.New("custom buckets: must not have negative buckets")
 		}
 	} else {
 		if err := checkHistogramSpans(h.PositiveSpans, len(h.PositiveBuckets)); err != nil {
@@ -807,7 +808,7 @@ func (h *FloatHistogram) Validate() error {
 			return fmt.Errorf("negative side: %w", err)
 		}
 		if h.CustomValues != nil {
-			return fmt.Errorf("histogram with exponential schema must not have custom bounds")
+			return errors.New("histogram with exponential schema must not have custom bounds")
 		}
 	}
 	err := checkHistogramBuckets(h.PositiveBuckets, &pCount, false)
@@ -948,10 +949,10 @@ func (h *FloatHistogram) floatBucketIterator(
 	positive bool, absoluteStartValue float64, targetSchema int32,
 ) floatBucketIterator {
 	if h.UsesCustomBuckets() && targetSchema != h.Schema {
-		panic(fmt.Errorf("cannot merge from custom buckets schema to exponential schema"))
+		panic(errors.New("cannot merge from custom buckets schema to exponential schema"))
 	}
 	if !h.UsesCustomBuckets() && IsCustomBucketsSchema(targetSchema) {
-		panic(fmt.Errorf("cannot merge from exponential buckets schema to custom schema"))
+		panic(errors.New("cannot merge from exponential buckets schema to custom schema"))
 	}
 	if targetSchema > h.Schema {
 		panic(fmt.Errorf("cannot merge from schema %d to %d", h.Schema, targetSchema))

model/histogram/histogram.go

@@ -14,6 +14,7 @@
 package histogram
 
 import (
+	"errors"
 	"fmt"
 	"math"
 	"slices"
@@ -432,16 +433,16 @@ func (h *Histogram) Validate() error {
 			return fmt.Errorf("custom buckets: %w", err)
 		}
 		if h.ZeroCount != 0 {
-			return fmt.Errorf("custom buckets: must have zero count of 0")
+			return errors.New("custom buckets: must have zero count of 0")
 		}
 		if h.ZeroThreshold != 0 {
-			return fmt.Errorf("custom buckets: must have zero threshold of 0")
+			return errors.New("custom buckets: must have zero threshold of 0")
 		}
 		if len(h.NegativeSpans) > 0 {
-			return fmt.Errorf("custom buckets: must not have negative spans")
+			return errors.New("custom buckets: must not have negative spans")
 		}
 		if len(h.NegativeBuckets) > 0 {
-			return fmt.Errorf("custom buckets: must not have negative buckets")
+			return errors.New("custom buckets: must not have negative buckets")
 		}
 	} else {
 		if err := checkHistogramSpans(h.PositiveSpans, len(h.PositiveBuckets)); err != nil {
@@ -455,7 +456,7 @@ func (h *Histogram) Validate() error {
 			return fmt.Errorf("negative side: %w", err)
 		}
 		if h.CustomValues != nil {
-			return fmt.Errorf("histogram with exponential schema must not have custom bounds")
+			return errors.New("histogram with exponential schema must not have custom bounds")
 		}
 	}
 	err := checkHistogramBuckets(h.PositiveBuckets, &pCount, true)

model/relabel/relabel.go

@@ -16,6 +16,7 @@ package relabel
 import (
 	"crypto/md5"
 	"encoding/binary"
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -114,10 +115,10 @@ func (c *Config) UnmarshalYAML(unmarshal func(interface{}) error) error {
 
 func (c *Config) Validate() error {
 	if c.Action == "" {
-		return fmt.Errorf("relabel action cannot be empty")
+		return errors.New("relabel action cannot be empty")
 	}
 	if c.Modulus == 0 && c.Action == HashMod {
-		return fmt.Errorf("relabel configuration for hashmod requires non-zero modulus")
+		return errors.New("relabel configuration for hashmod requires non-zero modulus")
 	}
 	if (c.Action == Replace || c.Action == HashMod || c.Action == Lowercase || c.Action == Uppercase || c.Action == KeepEqual || c.Action == DropEqual) && c.TargetLabel == "" {
 		return fmt.Errorf("relabel configuration for %s action requires 'target_label' value", c.Action)

model/rulefmt/rulefmt.go

@@ -184,14 +184,14 @@ type RuleNode struct {
 func (r *RuleNode) Validate() (nodes []WrappedError) {
 	if r.Record.Value != "" && r.Alert.Value != "" {
 		nodes = append(nodes, WrappedError{
-			err:     fmt.Errorf("only one of 'record' and 'alert' must be set"),
+			err:     errors.New("only one of 'record' and 'alert' must be set"),
 			node:    &r.Record,
 			nodeAlt: &r.Alert,
 		})
 	}
 	if r.Record.Value == "" && r.Alert.Value == "" {
 		nodes = append(nodes, WrappedError{
-			err:     fmt.Errorf("one of 'record' or 'alert' must be set"),
+			err:     errors.New("one of 'record' or 'alert' must be set"),
 			node:    &r.Record,
 			nodeAlt: &r.Alert,
 		})
@@ -199,7 +199,7 @@ func (r *RuleNode) Validate() (nodes []WrappedError) {
 
 	if r.Expr.Value == "" {
 		nodes = append(nodes, WrappedError{
-			err:  fmt.Errorf("field 'expr' must be set in rule"),
+			err:  errors.New("field 'expr' must be set in rule"),
 			node: &r.Expr,
 		})
 	} else if _, err := parser.ParseExpr(r.Expr.Value); err != nil {
@@ -211,19 +211,19 @@ func (r *RuleNode) Validate() (nodes []WrappedError) {
 	if r.Record.Value != "" {
 		if len(r.Annotations) > 0 {
 			nodes = append(nodes, WrappedError{
-				err:  fmt.Errorf("invalid field 'annotations' in recording rule"),
+				err:  errors.New("invalid field 'annotations' in recording rule"),
 				node: &r.Record,
 			})
 		}
 		if r.For != 0 {
 			nodes = append(nodes, WrappedError{
-				err:  fmt.Errorf("invalid field 'for' in recording rule"),
+				err:  errors.New("invalid field 'for' in recording rule"),
 				node: &r.Record,
 			})
 		}
 		if r.KeepFiringFor != 0 {
 			nodes = append(nodes, WrappedError{
-				err:  fmt.Errorf("invalid field 'keep_firing_for' in recording rule"),
+				err:  errors.New("invalid field 'keep_firing_for' in recording rule"),
 				node: &r.Record,
 			})
 		}

model/textparse/promparse.go

@@ -509,7 +509,7 @@ func yoloString(b []byte) string {
 func parseFloat(s string) (float64, error) {
 	// Keep to pre-Go 1.13 float formats.
 	if strings.ContainsAny(s, "pP_") {
-		return 0, fmt.Errorf("unsupported character in float")
+		return 0, errors.New("unsupported character in float")
 	}
 	return strconv.ParseFloat(s, 64)
 }

promql/engine.go

@@ -2047,7 +2047,7 @@ func (ev *evaluator) eval(ctx context.Context, expr parser.Expr) (parser.Value,
 		}
 		for i := range mat {
 			if len(mat[i].Floats)+len(mat[i].Histograms) != 1 {
-				panic(fmt.Errorf("unexpected number of samples"))
+				panic(errors.New("unexpected number of samples"))
 			}
 			for ts := ev.startTimestamp + ev.interval; ts <= ev.endTimestamp; ts += ev.interval {
 				if len(mat[i].Floats) > 0 {
@@ -3626,7 +3626,7 @@ func detectHistogramStatsDecoding(expr parser.Expr) {
 		if n, ok := node.(*parser.BinaryExpr); ok {
 			detectHistogramStatsDecoding(n.LHS)
 			detectHistogramStatsDecoding(n.RHS)
-			return fmt.Errorf("stop")
+			return errors.New("stop")
 		}
 
 		n, ok := (node).(*parser.VectorSelector)
@@ -3648,7 +3648,7 @@ func detectHistogramStatsDecoding(expr parser.Expr) {
 				break
 			}
 		}
-		return fmt.Errorf("stop")
+		return errors.New("stop")
 	})
 }
 

promql/info.go

@@ -90,7 +90,7 @@ func (ev *evaluator) infoSelectHints(expr parser.Expr) storage.SelectHints {
 				nodeTimestamp = n.Timestamp
 			}
 			offset = durationMilliseconds(n.OriginalOffset)
-			return fmt.Errorf("end traversal")
+			return errors.New("end traversal")
 		default:
 			return nil
 		}

promql/promqltest/test.go

@@ -672,7 +672,7 @@ func (ev *evalCmd) compareResult(result parser.Value) error {
 	switch val := result.(type) {
 	case promql.Matrix:
 		if ev.ordered {
-			return fmt.Errorf("expected ordered result, but query returned a matrix")
+			return errors.New("expected ordered result, but query returned a matrix")
 		}
 
 		if ev.expectScalar {

rules/alerting.go

@@ -15,6 +15,7 @@ package rules
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"log/slog"
 	"net/url"
@@ -403,7 +404,7 @@ func (r *AlertingRule) Eval(ctx context.Context, queryOffset time.Duration, ts t
 		resultFPs[h] = struct{}{}
 
 		if _, ok := alerts[h]; ok {
-			return nil, fmt.Errorf("vector contains metrics with the same labelset after applying alert labels")
+			return nil, errors.New("vector contains metrics with the same labelset after applying alert labels")
 		}
 
 		alerts[h] = &Alert{

rules/recording.go

@@ -15,6 +15,7 @@ package rules
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"net/url"
 	"time"
@@ -103,7 +104,7 @@ func (rule *RecordingRule) Eval(ctx context.Context, queryOffset time.Duration,
 	// Check that the rule does not produce identical metrics after applying
 	// labels.
 	if vector.ContainsSameLabelset() {
-		return nil, fmt.Errorf("vector contains metrics with the same labelset after applying rule labels")
+		return nil, errors.New("vector contains metrics with the same labelset after applying rule labels")
 	}
 
 	numSeries := len(vector)

scrape/manager_test.go

@@ -16,6 +16,7 @@ package scrape
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"net/http"
 	"net/http/httptest"
@@ -898,7 +899,7 @@ func doOneScrape(t *testing.T, manager *Manager, appender *collectResultAppender
 		if len(appender.resultFloats) > 0 {
 			return nil
 		}
-		return fmt.Errorf("expected some float samples, got none")
+		return errors.New("expected some float samples, got none")
 	}), "after 1 minute")
 	manager.Stop()
 }
@@ -1061,7 +1062,7 @@ func TestManagerCTZeroIngestionHistogram(t *testing.T) {
 				if len(app.resultHistograms) > 0 {
 					return nil
 				}
-				return fmt.Errorf("expected some histogram samples, got none")
+				return errors.New("expected some histogram samples, got none")
 			}), "after 1 minute")
 			scrapeManager.Stop()
 

scrape/scrape_test.go

@@ -1010,7 +1010,7 @@ func TestScrapeLoopForcedErr(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	sl := newBasicScrapeLoop(t, ctx, scraper, app, time.Second)
 
-	forcedErr := fmt.Errorf("forced err")
+	forcedErr := errors.New("forced err")
 	sl.setForcedError(forcedErr)
 
 	scraper.scrapeFunc = func(context.Context, io.Writer) error {
@@ -1464,7 +1464,7 @@ func TestScrapeLoopCache(t *testing.T) {
 		case 4:
 			cancel()
 		}
-		return fmt.Errorf("scrape failed")
+		return errors.New("scrape failed")
 	}
 
 	go func() {
@@ -3264,7 +3264,7 @@ func TestScrapeReportSingleAppender(t *testing.T) {
 	scraper.scrapeFunc = func(ctx context.Context, w io.Writer) error {
 		numScrapes++
 		if numScrapes%4 == 0 {
-			return fmt.Errorf("scrape failed")
+			return errors.New("scrape failed")
 		}
 		w.Write([]byte("metric_a 44\nmetric_b 44\nmetric_c 44\nmetric_d 44\n"))
 		return nil

storage/interface.go

@@ -41,17 +41,17 @@ var (
 	ErrOutOfOrderExemplar          = errors.New("out of order exemplar")
 	ErrDuplicateExemplar           = errors.New("duplicate exemplar")
 	ErrExemplarLabelLength         = fmt.Errorf("label length for exemplar exceeds maximum of %d UTF-8 characters", exemplar.ExemplarMaxLabelSetLength)
-	ErrExemplarsDisabled           = fmt.Errorf("exemplar storage is disabled or max exemplars is less than or equal to 0")
-	ErrNativeHistogramsDisabled    = fmt.Errorf("native histograms are disabled")
-	ErrOOONativeHistogramsDisabled = fmt.Errorf("out-of-order native histogram ingestion is disabled")
+	ErrExemplarsDisabled           = errors.New("exemplar storage is disabled or max exemplars is less than or equal to 0")
+	ErrNativeHistogramsDisabled    = errors.New("native histograms are disabled")
+	ErrOOONativeHistogramsDisabled = errors.New("out-of-order native histogram ingestion is disabled")
 
 	// ErrOutOfOrderCT indicates failed append of CT to the storage
 	// due to CT being older the then newer sample.
 	// NOTE(bwplotka): This can be both an instrumentation failure or commonly expected
 	// behaviour, and we currently don't have a way to determine this. As a result
 	// it's recommended to ignore this error for now.
-	ErrOutOfOrderCT      = fmt.Errorf("created timestamp out of order, ignoring")
-	ErrCTNewerThanSample = fmt.Errorf("CT is newer or the same as sample's timestamp, ignoring")
+	ErrOutOfOrderCT      = errors.New("created timestamp out of order, ignoring")
+	ErrCTNewerThanSample = errors.New("CT is newer or the same as sample's timestamp, ignoring")
 )
 
 // SeriesRef is a generic series reference. In prometheus it is either a

storage/remote/azuread/azuread.go

@@ -16,7 +16,6 @@ package azuread
 import (
 	"context"
 	"errors"
-	"fmt"
 	"net/http"
 	"strings"
 	"sync"
@@ -110,55 +109,55 @@ func (c *AzureADConfig) Validate() error {
 	}
 
 	if c.Cloud != AzureChina && c.Cloud != AzureGovernment && c.Cloud != AzurePublic {
-		return fmt.Errorf("must provide a cloud in the Azure AD config")
+		return errors.New("must provide a cloud in the Azure AD config")
 	}
 
 	if c.ManagedIdentity == nil && c.OAuth == nil && c.SDK == nil {
-		return fmt.Errorf("must provide an Azure Managed Identity, Azure OAuth or Azure SDK in the Azure AD config")
+		return errors.New("must provide an Azure Managed Identity, Azure OAuth or Azure SDK in the Azure AD config")
 	}
 
 	if c.ManagedIdentity != nil && c.OAuth != nil {
-		return fmt.Errorf("cannot provide both Azure Managed Identity and Azure OAuth in the Azure AD config")
+		return errors.New("cannot provide both Azure Managed Identity and Azure OAuth in the Azure AD config")
 	}
 
 	if c.ManagedIdentity != nil && c.SDK != nil {
-		return fmt.Errorf("cannot provide both Azure Managed Identity and Azure SDK in the Azure AD config")
+		return errors.New("cannot provide both Azure Managed Identity and Azure SDK in the Azure AD config")
 	}
 
 	if c.OAuth != nil && c.SDK != nil {
-		return fmt.Errorf("cannot provide both Azure OAuth and Azure SDK in the Azure AD config")
+		return errors.New("cannot provide both Azure OAuth and Azure SDK in the Azure AD config")
 	}
 
 	if c.ManagedIdentity != nil {
 		if c.ManagedIdentity.ClientID == "" {
-			return fmt.Errorf("must provide an Azure Managed Identity client_id in the Azure AD config")
+			return errors.New("must provide an Azure Managed Identity client_id in the Azure AD config")
 		}
 
 		_, err := uuid.Parse(c.ManagedIdentity.ClientID)
 		if err != nil {
-			return fmt.Errorf("the provided Azure Managed Identity client_id is invalid")
+			return errors.New("the provided Azure Managed Identity client_id is invalid")
 		}
 	}
 
 	if c.OAuth != nil {
 		if c.OAuth.ClientID == "" {
-			return fmt.Errorf("must provide an Azure OAuth client_id in the Azure AD config")
+			return errors.New("must provide an Azure OAuth client_id in the Azure AD config")
 		}
 		if c.OAuth.ClientSecret == "" {
-			return fmt.Errorf("must provide an Azure OAuth client_secret in the Azure AD config")
+			return errors.New("must provide an Azure OAuth client_secret in the Azure AD config")
 		}
 		if c.OAuth.TenantID == "" {
-			return fmt.Errorf("must provide an Azure OAuth tenant_id in the Azure AD config")
+			return errors.New("must provide an Azure OAuth tenant_id in the Azure AD config")
 		}
 
 		var err error
 		_, err = uuid.Parse(c.OAuth.ClientID)
 		if err != nil {
-			return fmt.Errorf("the provided Azure OAuth client_id is invalid")
+			return errors.New("the provided Azure OAuth client_id is invalid")
 		}
 		_, err = regexp.MatchString("^[0-9a-zA-Z-.]+$", c.OAuth.TenantID)
 		if err != nil {
-			return fmt.Errorf("the provided Azure OAuth tenant_id is invalid")
+			return errors.New("the provided Azure OAuth tenant_id is invalid")
 		}
 	}
 
@@ -168,7 +167,7 @@ func (c *AzureADConfig) Validate() error {
 		if c.SDK.TenantID != "" {
 			_, err = regexp.MatchString("^[0-9a-zA-Z-.]+$", c.SDK.TenantID)
 			if err != nil {
-				return fmt.Errorf("the provided Azure OAuth tenant_id is invalid")
+				return errors.New("the provided Azure OAuth tenant_id is invalid")
 			}
 		}
 	}

storage/remote/queue_manager_test.go

@@ -763,7 +763,7 @@ func TestDisableReshardOnRetry(t *testing.T) {
 				onStoreCalled()
 
 				return WriteResponseStats{}, RecoverableError{
-					error:      fmt.Errorf("fake error"),
+					error:      errors.New("fake error"),
 					retryAfter: model.Duration(retryAfter),
 				}
 			},

storage/remote/write_handler_test.go

@@ -672,7 +672,7 @@ func TestCommitErr_V1Message(t *testing.T) {
 	req, err := http.NewRequest("", "", bytes.NewReader(payload))
 	require.NoError(t, err)
 
-	appendable := &mockAppendable{commitErr: fmt.Errorf("commit error")}
+	appendable := &mockAppendable{commitErr: errors.New("commit error")}
 	handler := NewWriteHandler(promslog.NewNopLogger(), nil, appendable, []config.RemoteWriteProtoMsg{config.RemoteWriteProtoMsgV1})
 
 	recorder := httptest.NewRecorder()
@@ -696,7 +696,7 @@ func TestCommitErr_V2Message(t *testing.T) {
 	req.Header.Set("Content-Encoding", string(SnappyBlockCompression))
 	req.Header.Set(RemoteWriteVersionHeader, RemoteWriteVersion20HeaderValue)
 
-	appendable := &mockAppendable{commitErr: fmt.Errorf("commit error")}
+	appendable := &mockAppendable{commitErr: errors.New("commit error")}
 	handler := NewWriteHandler(promslog.NewNopLogger(), nil, appendable, []config.RemoteWriteProtoMsg{config.RemoteWriteProtoMsgV2})
 
 	recorder := httptest.NewRecorder()

tsdb/chunkenc/chunk_test.go

@@ -132,7 +132,7 @@ func TestPool(t *testing.T) {
 		{
 			name:     "invalid encoding",
 			encoding: EncNone,
-			expErr:   fmt.Errorf(`invalid chunk encoding "none"`),
+			expErr:   errors.New(`invalid chunk encoding "none"`),
 		},
 	} {
 		t.Run(tc.name, func(t *testing.T) {

tsdb/chunkenc/float_histogram.go

@@ -15,6 +15,7 @@ package chunkenc
 
 import (
 	"encoding/binary"
+	"errors"
 	"fmt"
 	"math"
 
@@ -761,9 +762,9 @@ func (a *FloatHistogramAppender) AppendFloatHistogram(prev *FloatHistogramAppend
 		if !okToAppend || counterReset {
 			if appendOnly {
 				if counterReset {
-					return nil, false, a, fmt.Errorf("float histogram counter reset")
+					return nil, false, a, errors.New("float histogram counter reset")
 				}
-				return nil, false, a, fmt.Errorf("float histogram schema change")
+				return nil, false, a, errors.New("float histogram schema change")
 			}
 			newChunk := NewFloatHistogramChunk()
 			app, err := newChunk.Appender()
@@ -812,7 +813,7 @@ func (a *FloatHistogramAppender) AppendFloatHistogram(prev *FloatHistogramAppend
 	pForwardInserts, nForwardInserts, pBackwardInserts, nBackwardInserts, pMergedSpans, nMergedSpans, okToAppend := a.appendableGauge(h)
 	if !okToAppend {
 		if appendOnly {
-			return nil, false, a, fmt.Errorf("float gauge histogram schema change")
+			return nil, false, a, errors.New("float gauge histogram schema change")
 		}
 		newChunk := NewFloatHistogramChunk()
 		app, err := newChunk.Appender()

tsdb/chunkenc/histogram.go

@@ -15,6 +15,7 @@ package chunkenc
 
 import (
 	"encoding/binary"
+	"errors"
 	"fmt"
 	"math"
 
@@ -795,9 +796,9 @@ func (a *HistogramAppender) AppendHistogram(prev *HistogramAppender, t int64, h
 		if !okToAppend || counterReset {
 			if appendOnly {
 				if counterReset {
-					return nil, false, a, fmt.Errorf("histogram counter reset")
+					return nil, false, a, errors.New("histogram counter reset")
 				}
-				return nil, false, a, fmt.Errorf("histogram schema change")
+				return nil, false, a, errors.New("histogram schema change")
 			}
 			newChunk := NewHistogramChunk()
 			app, err := newChunk.Appender()
@@ -846,7 +847,7 @@ func (a *HistogramAppender) AppendHistogram(prev *HistogramAppender, t int64, h
 	pForwardInserts, nForwardInserts, pBackwardInserts, nBackwardInserts, pMergedSpans, nMergedSpans, okToAppend := a.appendableGauge(h)
 	if !okToAppend {
 		if appendOnly {
-			return nil, false, a, fmt.Errorf("gauge histogram schema change")
+			return nil, false, a, errors.New("gauge histogram schema change")
 		}
 		newChunk := NewHistogramChunk()
 		app, err := newChunk.Appender()

tsdb/chunks/chunks.go

@@ -16,6 +16,7 @@ package chunks
 import (
 	"bufio"
 	"encoding/binary"
+	"errors"
 	"fmt"
 	"hash"
 	"hash/crc32"
@@ -172,7 +173,7 @@ func ChunkFromSamplesGeneric(s Samples) (Meta, error) {
 				return emptyChunk, err
 			}
 			if newChunk != nil {
-				return emptyChunk, fmt.Errorf("did not expect to start a second chunk")
+				return emptyChunk, errors.New("did not expect to start a second chunk")
 			}
 		case chunkenc.ValFloatHistogram:
 			newChunk, _, ca, err = ca.AppendFloatHistogram(nil, s.Get(i).T(), s.Get(i).FH(), false)
@@ -180,7 +181,7 @@ func ChunkFromSamplesGeneric(s Samples) (Meta, error) {
 				return emptyChunk, err
 			}
 			if newChunk != nil {
-				return emptyChunk, fmt.Errorf("did not expect to start a second chunk")
+				return emptyChunk, errors.New("did not expect to start a second chunk")
 			}
 		default:
 			panic(fmt.Sprintf("unknown sample type %s", sampleType.String()))
@@ -250,7 +251,7 @@ func (cm *Meta) OverlapsClosedInterval(mint, maxt int64) bool {
 	return cm.MinTime <= maxt && mint <= cm.MaxTime
 }
 
-var errInvalidSize = fmt.Errorf("invalid size")
+var errInvalidSize = errors.New("invalid size")
 
 var castagnoliTable *crc32.Table
 

tsdb/compact.go

@@ -184,7 +184,7 @@ func NewLeveledCompactor(ctx context.Context, r prometheus.Registerer, l *slog.L
 
 func NewLeveledCompactorWithOptions(ctx context.Context, r prometheus.Registerer, l *slog.Logger, ranges []int64, pool chunkenc.Pool, opts LeveledCompactorOptions) (*LeveledCompactor, error) {
 	if len(ranges) == 0 {
-		return nil, fmt.Errorf("at least one range must be provided")
+		return nil, errors.New("at least one range must be provided")
 	}
 	if pool == nil {
 		pool = chunkenc.NewPool()

tsdb/db.go

@@ -2004,10 +2004,10 @@ func (db *DB) ForceHeadMMap() {
 // will create a new block containing all data that's currently in the memory buffer/WAL.
 func (db *DB) Snapshot(dir string, withHead bool) error {
 	if dir == db.dir {
-		return fmt.Errorf("cannot snapshot into base directory")
+		return errors.New("cannot snapshot into base directory")
 	}
 	if _, err := ulid.ParseStrict(dir); err == nil {
-		return fmt.Errorf("dir must not be a valid ULID")
+		return errors.New("dir must not be a valid ULID")
 	}
 
 	db.cmtx.Lock()

tsdb/db_test.go

@@ -18,6 +18,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/binary"
+	"errors"
 	"flag"
 	"fmt"
 	"hash/crc32"
@@ -1432,7 +1433,7 @@ func (*mockCompactorFailing) Plan(string) ([]string, 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")
+		return []ulid.ULID{}, errors.New("the compactor already did the maximum allowed blocks so it is time to fail")
 	}
 
 	block, err := OpenBlock(nil, createBlock(c.t, dest, genSeries(1, 1, 0, 1)), nil)
@@ -1459,7 +1460,7 @@ func (*mockCompactorFailing) Compact(string, []string, []*Block) ([]ulid.ULID, e
 }
 
 func (*mockCompactorFailing) CompactOOO(string, *OOOCompactionHead) (result []ulid.ULID, err error) {
-	return nil, fmt.Errorf("mock compaction failing CompactOOO")
+	return nil, errors.New("mock compaction failing CompactOOO")
 }
 
 func TestTimeRetention(t *testing.T) {

tsdb/ooo_head_read_test.go

@@ -509,7 +509,7 @@ func testOOOHeadChunkReader_Chunk(t *testing.T, scenario sampleTypeScenario) {
 			Ref: 0x1800000, Chunk: chunkenc.Chunk(nil), MinTime: 100, MaxTime: 300,
 		})
 		require.Nil(t, iterable)
-		require.Equal(t, err, fmt.Errorf("not found"))
+		require.EqualError(t, err, "not found")
 		require.Nil(t, c)
 	})
 

tsdb/querier_test.go

@@ -3324,7 +3324,7 @@ func (m mockMatcherIndex) LabelNames(context.Context, ...*labels.Matcher) ([]str
 }
 
 func (m mockMatcherIndex) PostingsForLabelMatching(context.Context, string, func(string) bool) index.Postings {
-	return index.ErrPostings(fmt.Errorf("PostingsForLabelMatching called"))
+	return index.ErrPostings(errors.New("PostingsForLabelMatching called"))
 }
 
 func TestPostingsForMatcher(t *testing.T) {

tsdb/tsdbblockutil.go

@@ -15,6 +15,7 @@ package tsdb
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"log/slog"
 	"path/filepath"
@@ -23,7 +24,7 @@ import (
 	"github.com/prometheus/prometheus/tsdb/chunkenc"
 )
 
-var ErrInvalidTimes = fmt.Errorf("max time is lesser than min time")
+var ErrInvalidTimes = errors.New("max time is lesser than min time")
 
 // CreateBlock creates a chunkrange block from the samples passed to it, and writes it to disk.
 func CreateBlock(series []storage.Series, dir string, chunkRange int64, logger *slog.Logger) (string, error) {

web/api/v1/api.go

@@ -1606,7 +1606,7 @@ func parseListRulesPaginationRequest(r *http.Request) (int64, string, *apiFuncRe
 	nextToken := r.URL.Query().Get("group_next_token")
 
 	if nextToken != "" && maxGroups == "" {
-		errResult := invalidParamError(fmt.Errorf("group_limit needs to be present in order to paginate over the groups"), "group_next_token")
+		errResult := invalidParamError(errors.New("group_limit needs to be present in order to paginate over the groups"), "group_next_token")
 		return -1, "", &errResult
 	}
 
@@ -1617,7 +1617,7 @@ func parseListRulesPaginationRequest(r *http.Request) (int64, string, *apiFuncRe
 			return -1, "", &errResult
 		}
 		if parsedMaxGroups <= 0 {
-			errResult := invalidParamError(fmt.Errorf("group_limit needs to be greater than 0"), "group_limit")
+			errResult := invalidParamError(errors.New("group_limit needs to be greater than 0"), "group_limit")
 			return -1, "", &errResult
 		}
 	}

web/api/v1/api_test.go

@@ -615,7 +615,7 @@ func TestGetSeries(t *testing.T) {
 			matchers:          []string{`{foo="boo"}`, `{foo="baz"}`},
 			expectedErrorType: errorExec,
 			api: &API{
-				Queryable: errorTestQueryable{err: fmt.Errorf("generic")},
+				Queryable: errorTestQueryable{err: errors.New("generic")},
 			},
 		},
 		{
@@ -623,7 +623,7 @@ func TestGetSeries(t *testing.T) {
 			matchers:          []string{`{foo="boo"}`, `{foo="baz"}`},
 			expectedErrorType: errorInternal,
 			api: &API{
-				Queryable: errorTestQueryable{err: promql.ErrStorage{Err: fmt.Errorf("generic")}},
+				Queryable: errorTestQueryable{err: promql.ErrStorage{Err: errors.New("generic")}},
 			},
 		},
 	} {
@@ -717,7 +717,7 @@ func TestQueryExemplars(t *testing.T) {
 			name:              "should return errorExec upon genetic error",
 			expectedErrorType: errorExec,
 			api: &API{
-				ExemplarQueryable: errorTestQueryable{err: fmt.Errorf("generic")},
+				ExemplarQueryable: errorTestQueryable{err: errors.New("generic")},
 			},
 			query: url.Values{
 				"query": []string{`test_metric3{foo="boo"} - test_metric4{foo="bar"}`},
@@ -729,7 +729,7 @@ func TestQueryExemplars(t *testing.T) {
 			name:              "should return errorInternal err type is ErrStorage",
 			expectedErrorType: errorInternal,
 			api: &API{
-				ExemplarQueryable: errorTestQueryable{err: promql.ErrStorage{Err: fmt.Errorf("generic")}},
+				ExemplarQueryable: errorTestQueryable{err: promql.ErrStorage{Err: errors.New("generic")}},
 			},
 			query: url.Values{
 				"query": []string{`test_metric3{foo="boo"} - test_metric4{foo="bar"}`},
@@ -838,7 +838,7 @@ func TestLabelNames(t *testing.T) {
 			matchers:          []string{`{foo="boo"}`, `{foo="baz"}`},
 			expectedErrorType: errorExec,
 			api: &API{
-				Queryable: errorTestQueryable{err: fmt.Errorf("generic")},
+				Queryable: errorTestQueryable{err: errors.New("generic")},
 			},
 		},
 		{
@@ -846,7 +846,7 @@ func TestLabelNames(t *testing.T) {
 			matchers:          []string{`{foo="boo"}`, `{foo="baz"}`},
 			expectedErrorType: errorInternal,
 			api: &API{
-				Queryable: errorTestQueryable{err: promql.ErrStorage{Err: fmt.Errorf("generic")}},
+				Queryable: errorTestQueryable{err: promql.ErrStorage{Err: errors.New("generic")}},
 			},
 		},
 	} {