loki: backend-queries: set interval-value in dataframe (#44965)

* loki: backend-queries: set interval-value in dataframe

* fixed unit test

* added interval-specific unit test

pkg/tsdb/loki/loki.go

@@ -188,9 +188,11 @@ func parseResponse(value *loghttp.QueryResponse, query *lokiQuery) (data.Frames,
 			values = append(values, float64(k.Value))
 		}
 
-		frames = append(frames, data.NewFrame(name,
-			data.NewField("time", nil, timeVector),
-			data.NewField("value", tags, values).SetConfig(&data.FieldConfig{DisplayNameFromDS: name})))
+		timeField := data.NewField("time", nil, timeVector)
+		timeField.Config = &data.FieldConfig{Interval: float64(query.Step.Milliseconds())}
+		valueField := data.NewField("value", tags, values).SetConfig(&data.FieldConfig{DisplayNameFromDS: name})
+
+		frames = append(frames, data.NewFrame(name, timeField, valueField))
 	}
 
 	return frames, nil

pkg/tsdb/loki/loki_test.go

@@ -74,6 +74,7 @@ func TestParseResponse(t *testing.T) {
 
 		query := &lokiQuery{
 			LegendFormat: "legend {{app}}",
+			Step:         time.Second * 42,
 		}
 		frame, err := parseResponse(&value, query)
 		require.NoError(t, err)
@@ -87,6 +88,7 @@ func TestParseResponse(t *testing.T) {
 			time.Date(1970, 1, 1, 0, 0, 4, 0, time.UTC),
 			time.Date(1970, 1, 1, 0, 0, 5, 0, time.UTC),
 		})
+		field1.Config = &data.FieldConfig{Interval: float64(42000)}
 		field2 := data.NewField("value", labels, []float64{1, 2, 3, 4, 5})
 		field2.SetConfig(&data.FieldConfig{DisplayNameFromDS: "legend Application"})
 		testFrame := data.NewFrame("legend Application", field1, field2)
@@ -95,4 +97,36 @@ func TestParseResponse(t *testing.T) {
 			t.Errorf("Result mismatch (-want +got):\n%s", diff)
 		}
 	})
+
+	t.Run("should set interval-attribute in response", func(t *testing.T) {
+		values := []p.SamplePair{
+			{Value: 1, Timestamp: 1000},
+		}
+		value := loghttp.QueryResponse{
+			Data: loghttp.QueryResponseData{
+				Result: loghttp.Matrix{
+					p.SampleStream{
+						Values: values,
+					},
+				},
+			},
+		}
+
+		query := &lokiQuery{
+			Step: time.Second * 42,
+		}
+
+		frames, err := parseResponse(&value, query)
+		require.NoError(t, err)
+
+		// to keep the test simple, we assume the
+		// first field is the time-field
+		timeField := frames[0].Fields[0]
+		require.NotNil(t, timeField)
+		require.Equal(t, data.FieldTypeTime, timeField.Type())
+
+		timeFieldConfig := timeField.Config
+		require.NotNil(t, timeFieldConfig)
+		require.Equal(t, float64(42000), timeFieldConfig.Interval)
+	})
 }

pkg/tsdb/loki/testdata/matrix_gap.golden.txt

@@ -18,4 +18,4 @@ Dimensions: 2 Fields by 6 Rows
 
 
 ====== TEST DATA RESPONSE (arrow base64) ======
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pkg/tsdb/loki/testdata/matrix_inf.golden.txt

@@ -14,4 +14,4 @@ Dimensions: 2 Fields by 2 Rows
 
 
 ====== TEST DATA RESPONSE (arrow base64) ======
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pkg/tsdb/loki/testdata/matrix_nan.golden.txt

@@ -14,4 +14,4 @@ Dimensions: 2 Fields by 2 Rows
 
 
 ====== TEST DATA RESPONSE (arrow base64) ======
-FRAME=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pkg/tsdb/loki/testdata/matrix_simple.golden.txt

@@ -33,5 +33,5 @@ Dimensions: 2 Fields by 5 Rows
 
 
 ====== TEST DATA RESPONSE (arrow base64) ======
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