Maintenance: improve error wrapping

internal/healthcheck/client.go

@@ -2,11 +2,16 @@ package healthcheck
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
 )
 
+var (
+	ErrHTTPStatusNotOK = errors.New("HTTP response status is not OK")
+)
+
 type Checker interface {
 	Check(ctx context.Context, url string) error
 }
@@ -38,5 +43,5 @@ func (h *checker) Check(ctx context.Context, url string) error {
 	if err != nil {
 		return err
 	}
-	return fmt.Errorf("%s: %s", response.Status, string(b))
+	return fmt.Errorf("%w: %s: %s", ErrHTTPStatusNotOK, response.Status, string(b))
 }