refactor (documentation): move from github.com/pkg/errors to 'errors' and 'fmt' (#10808)

Signed-off-by: Matthieu MOREL <mmorel-35@users.noreply.github.com>

Co-authored-by: Matthieu MOREL <mmorel-35@users.noreply.github.com>

documentation/examples/remote_storage/go.mod

@@ -7,7 +7,6 @@ require (
 	github.com/gogo/protobuf v1.3.2
 	github.com/golang/snappy v0.0.4
 	github.com/influxdata/influxdb v1.9.5
-	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.12.1
 	github.com/prometheus/common v0.32.1
 	github.com/prometheus/prometheus v1.8.2-0.20220202104425-d819219dd438
@@ -30,6 +29,7 @@ require (
 	github.com/jpillora/backoff v1.0.0 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369 // indirect
 	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f // indirect
+	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_model v0.2.0 // indirect
 	github.com/prometheus/common/sigv4 v0.1.0 // indirect

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

@@ -15,6 +15,7 @@ package influxdb
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"math"
 	"os"
@@ -23,7 +24,6 @@ import (
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
 	influx "github.com/influxdata/influxdb/client/v2"
-	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/model"
 
@@ -174,7 +174,7 @@ func (c *Client) buildCommand(q *prompb.Query) (string, error) {
 		case prompb.LabelMatcher_NRE:
 			matchers = append(matchers, fmt.Sprintf("%q !~ /^%s$/", m.Name, escapeSlashes(m.Value)))
 		default:
-			return "", errors.Errorf("unknown match type %v", m.Type)
+			return "", fmt.Errorf("unknown match type %v", m.Type)
 		}
 	}
 	matchers = append(matchers, fmt.Sprintf("time >= %vms", q.StartTimestampMs))
@@ -253,27 +253,27 @@ func valuesToSamples(values [][]interface{}) ([]prompb.Sample, error) {
 	samples := make([]prompb.Sample, 0, len(values))
 	for _, v := range values {
 		if len(v) != 2 {
-			return nil, errors.Errorf("bad sample tuple length, expected [<timestamp>, <value>], got %v", v)
+			return nil, fmt.Errorf("bad sample tuple length, expected [<timestamp>, <value>], got %v", v)
 		}
 
 		jsonTimestamp, ok := v[0].(json.Number)
 		if !ok {
-			return nil, errors.Errorf("bad timestamp: %v", v[0])
+			return nil, fmt.Errorf("bad timestamp: %v", v[0])
 		}
 
 		jsonValue, ok := v[1].(json.Number)
 		if !ok {
-			return nil, errors.Errorf("bad sample value: %v", v[1])
+			return nil, fmt.Errorf("bad sample value: %v", v[1])
 		}
 
 		timestamp, err := jsonTimestamp.Int64()
 		if err != nil {
-			return nil, errors.Wrap(err, "unable to convert sample timestamp to int64")
+			return nil, fmt.Errorf("unable to convert sample timestamp to int64: %w", err)
 		}
 
 		value, err := jsonValue.Float64()
 		if err != nil {
-			return nil, errors.Wrap(err, "unable to convert sample value to float64")
+			return nil, fmt.Errorf("unable to convert sample value to float64: %w", err)
 		}
 
 		samples = append(samples, prompb.Sample{

documentation/examples/remote_storage/remote_storage_adapter/main.go

@@ -30,7 +30,6 @@ import (
 	"github.com/gogo/protobuf/proto"
 	"github.com/golang/snappy"
 	influx "github.com/influxdata/influxdb/client/v2"
-	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/prometheus/common/model"
@@ -148,7 +147,7 @@ func parseFlags() *config {
 
 	_, err := a.Parse(os.Args[1:])
 	if err != nil {
-		fmt.Fprintln(os.Stderr, errors.Wrapf(err, "Error parsing commandline arguments"))
+		fmt.Fprintln(os.Stderr, fmt.Errorf("Error parsing commandline arguments: %w", err))
 		a.Usage(os.Args[1:])
 		os.Exit(2)
 	}

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

@@ -17,6 +17,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"fmt"
 	"io"
 	"math"
 	"net/http"
@@ -25,7 +26,6 @@ import (
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
-	"github.com/pkg/errors"
 	"github.com/prometheus/common/model"
 )
 
@@ -136,7 +136,7 @@ func (c *Client) Write(samples model.Samples) error {
 	if err := json.Unmarshal(buf, &r); err != nil {
 		return err
 	}
-	return errors.Errorf("failed to write %d samples to OpenTSDB, %d succeeded", r["failed"], r["success"])
+	return fmt.Errorf("failed to write %d samples to OpenTSDB, %d succeeded", r["failed"], r["success"])
 }
 
 // Name identifies the client as an OpenTSDB client.

documentation/examples/remote_storage/remote_storage_adapter/opentsdb/tagvalue.go

@@ -17,7 +17,6 @@ import (
 	"bytes"
 	"fmt"
 
-	"github.com/pkg/errors"
 	"github.com/prometheus/common/model"
 )
 
@@ -98,13 +97,13 @@ func (tv *TagValue) UnmarshalJSON(json []byte) error {
 	for i, b := range json {
 		if i == 0 {
 			if b != '"' {
-				return errors.Errorf("expected '\"', got %q", b)
+				return fmt.Errorf("expected '\"', got %q", b)
 			}
 			continue
 		}
 		if i == len(json)-1 {
 			if b != '"' {
-				return errors.Errorf("expected '\"', got %q", b)
+				return fmt.Errorf("expected '\"', got %q", b)
 			}
 			break
 		}
@@ -130,7 +129,7 @@ func (tv *TagValue) UnmarshalJSON(json []byte) error {
 				parsedByte = (b - 55) << 4
 				escapeLevel = 2
 			default:
-				return errors.Errorf(
+				return fmt.Errorf(
 					"illegal escape sequence at byte %d (%c)",
 					i, b,
 				)
@@ -142,7 +141,7 @@ func (tv *TagValue) UnmarshalJSON(json []byte) error {
 			case b >= 'A' && b <= 'F': // A-F
 				parsedByte += b - 55
 			default:
-				return errors.Errorf(
+				return fmt.Errorf(
 					"illegal escape sequence at byte %d (%c)",
 					i, b,
 				)