Tempo: Convert tempo to backend data source2 (#31733)

This reverts commit c15d1f498a.

(cherry picked from commit 29c998f9eb)

pkg/tsdb/tempo/tempo.go

@@ -35,11 +35,11 @@ func newTempoExecutor(dsInfo *models.DataSource) (tsdb.TsdbQueryEndpoint, error)
 }
 
 var (
-	plog log.Logger
+	tlog log.Logger
 )
 
 func init() {
-	plog = log.New("tsdb.tempo")
+	tlog = log.New("tsdb.tempo")
 	tsdb.RegisterTsdbQueryEndpoint("tempo", newTempoExecutor)
 }
 
@@ -53,7 +53,7 @@ func (e *tempoExecutor) Query(ctx context.Context, dsInfo *models.DataSource, ts
 
 	traceID := tsdbQuery.Queries[0].Model.Get("query").MustString("")
 
-	plog.Debug("Querying tempo with traceID", "traceID", traceID)
+	tlog.Debug("Querying tempo with traceID", "traceID", traceID)
 
 	req, err := http.NewRequestWithContext(ctx, "GET", dsInfo.Url+"/api/traces/"+traceID, nil)
 	if err != nil {
@@ -73,20 +73,21 @@ func (e *tempoExecutor) Query(ctx context.Context, dsInfo *models.DataSource, ts
 
 	defer func() {
 		if err := resp.Body.Close(); err != nil {
-			plog.Warn("failed to close response body", "err", err)
+			tlog.Warn("failed to close response body", "err", err)
 		}
 	}()
 
-	if resp.StatusCode == http.StatusNotFound {
-		queryResult.Error = fmt.Errorf("failed to get trace: %s", traceID)
-		return result, nil
-	}
-
 	body, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
 		return nil, err
 	}
 
+	if resp.StatusCode != http.StatusOK {
+		queryResult.Error = fmt.Errorf("failed to get trace: %s", traceID)
+		tlog.Error("Request to tempo failed", "Status", resp.Status, "Body", string(body))
+		return result, nil
+	}
+
 	otTrace := ot_pdata.NewTraces()
 	err = otTrace.FromOtlpProtoBytes(body)
 	if err != nil {

public/app/plugins/datasource/tempo/ConfigEditor.tsx

@@ -9,7 +9,7 @@ export const ConfigEditor: React.FC<Props> = ({ options, onOptionsChange }) => {
   return (
     <>
       <DataSourceHttpSettings
-        defaultUrl="http://localhost:16686"
+        defaultUrl="http://tempo"
         dataSourceConfig={options}
         showAccessOptions={false}
         onChange={onOptionsChange}