Failing test to be fixed once metadata is written somewhere else

tsdb/metadata.go

@@ -0,0 +1 @@
+package tsdb

tsdb/metadata_test.go

@@ -0,0 +1,63 @@
+package tsdb
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/prometheus/prometheus/model/labels"
+	"github.com/prometheus/prometheus/tsdb/chunks"
+)
+
+func TestDBAppenderSeriesWithMetadata(t *testing.T) {
+	db := openTestDB(t, nil, nil)
+	defer func() {
+		require.NoError(t, db.Close())
+	}()
+
+	ctx := context.Background()
+	app1 := db.Appender(ctx)
+
+	// Add a sample with metadata.
+	_, err := app1.Append(0, labels.FromStrings(
+		"__name__", "http_requests_total",
+		"job", "ingester",
+		"metadata.foo.service", "ingester",
+		"metadata.foo.request_type", "outbound",
+		"metadata.node.ip", "192.168.1.1",
+	), 0, 0)
+	require.NoError(t, err)
+
+	// Add a sample with the same metadata but different value.
+	_, err = app1.Append(0, labels.FromStrings(
+		"__name__", "http_requests_total",
+		"job", "ingester",
+		"metadata.foo.service", "ingester",
+		"metadata.foo.request_type", "outbound",
+		"metadata.node.ip", "192.168.1.2",
+	), 1, 1)
+	require.NoError(t, err)
+
+	err = app1.Commit()
+	require.NoError(t, err)
+
+	q, err := db.Querier(0, 200)
+	require.NoError(t, err)
+
+	res := query(t, q, labels.MustNewMatcher(labels.MatchEqual, "__name__", "http_requests_total"))
+
+	// TODO(jesusvazquez) There should be a single series http_requests_total{job="ingester"} with two samples since the metadata does not form part of the series.
+	require.Equal(t, map[string][]chunks.Sample{
+		labels.FromStrings(
+			"__name__", "http_requests_total",
+			"job", "ingester",
+		).String(): {
+			sample{t: 0, f: 0},
+			sample{t: 1, f: 1},
+		},
+	}, res)
+
+	// TODO(jesusvazquez) Add a test to verify that the metadata is stored in the metadata store.
+	// TODO(jesusvazquez) Add a test to make sure metadata changes between timestamps.
+}