remove usage of github.com/pkg/errors

Signed-off-by: Christoph Maser <[email protected]>

notify/rocketchat/rocketchat.go

@@ -23,7 +23,6 @@ import (
 	"os"
 	"strings"
 
-	"github.com/pkg/errors"
 	commoncfg "github.com/prometheus/common/config"
 
 	"github.com/prometheus/alertmanager/template"
@@ -224,14 +223,14 @@ func (n *Notifier) Notify(ctx context.Context, as ...*types.Alert) (bool, error)
 	// classify them as retriable or not.
 	retry, err := n.retrier.Check(resp.StatusCode, resp.Body)
 	if err != nil {
-		err = errors.Wrap(err, fmt.Sprintf("channel %q", body.Channel))
+		err = fmt.Errorf("%w: channel %q", err, body.Channel)
 		return retry, notify.NewErrorWithReason(notify.GetFailureReasonFromStatusCode(resp.StatusCode), err)
 	}
 
 	// Rocketchat web API might return errors with a 200 response code.
 	retry, err = checkResponseError(resp)
 	if err != nil {
-		err = errors.Wrap(err, fmt.Sprintf("channel %q", body.Channel))
+		err = fmt.Errorf("%w: channel %q", err, body.Channel)
 		return retry, notify.NewErrorWithReason(notify.ClientErrorReason, err)
 	}
 
@@ -242,7 +241,7 @@ func (n *Notifier) Notify(ctx context.Context, as ...*types.Alert) (bool, error)
 func checkResponseError(resp *http.Response) (bool, error) {
 	body, err := io.ReadAll(resp.Body)
 	if err != nil {
-		return true, errors.Wrap(err, "could not read response body")
+		return true, fmt.Errorf("%w: could not read response body: ", err)
 	}
 
 	return checkJSONResponseError(body)
@@ -258,7 +257,7 @@ func checkJSONResponseError(body []byte) (bool, error) {
 
 	var data response
 	if err := json.Unmarshal(body, &data); err != nil {
-		return true, errors.Wrapf(err, "could not unmarshal JSON response %q", string(body))
+		return true, fmt.Errorf("%w: could not unmarshal JSON response %q", err, string(body))
 	}
 	if !data.Success {
 		return false, fmt.Errorf("error response from Rocketchat: %s", data.Error)