chore: unnecessary use of fmt.Sprintf

src/ctl/service/r2/store/stub/store.go

@@ -410,7 +410,7 @@ func (s *store) CreateNamespace(
 	case s.data.ErrorNamespace:
 		return view.Namespace{}, r2.NewInternalError(fmt.Sprintf("could not create namespace: %s", namespaceID))
 	case s.data.ConflictNamespace:
-		return view.Namespace{}, r2.NewVersionError(fmt.Sprintf("namespaces version mismatch"))
+		return view.Namespace{}, r2.NewVersionError("namespaces version mismatch")
 	default:
 		for _, n := range s.data.Namespaces.Namespaces {
 			if namespaceID == n.ID {

src/dbnode/storage/shard_fetch_blocks_metadata_test.go

@@ -290,7 +290,7 @@ func TestShardFetchBlocksMetadataV2WithSeriesCachePolicyNotCacheAll(t *testing.T
 			if expectedBlock.Checksum == nil {
 				assert.Nil(t, actualBlock.Checksum)
 			} else if actualBlock.Checksum == nil {
-				assert.Fail(t, fmt.Sprintf("expected checksum but no actual checksum"))
+				assert.Fail(t, "expected checksum but no actual checksum")
 			} else {
 				assert.Equal(t, *expectedBlock.Checksum, *actualBlock.Checksum)
 			}

src/query/graphite/graphite/graphite_types.go

@@ -23,7 +23,6 @@ package graphite
 import (
 	"bytes"
 	"encoding/json"
-	"fmt"
 	"math"
 	"net/http"
 	"strconv"
@@ -106,7 +105,7 @@ func (dp RenderDatapoints) Get(i int) (time.Time, float64) {
 	case time.Time:
 		return timestamp, value
 	default:
-		panic(fmt.Sprintf("unsupported timestamp type"))
+		panic("unsupported timestamp type")
 	}
 }