add query user and query source to "executing query" log lines

Signed-off-by: Callum Styan <[email protected]>

pkg/logql/engine.go

@@ -225,6 +225,32 @@ func (q *query) resultLength(res promql_parser.Value) int {
 	}
 }
 
+// findSource looks for a query source in the QueryTags.
+func findSource(tags string) string {
+	source := strings.SplitN(tags, "Source=", 2)
+	if len(source) == 2 {
+		source = strings.Split(source[1], ",")
+		return source[0]
+	}
+	// look for source lowercase since that's what we insert for grafana alert
+	source = strings.SplitN(tags, "source=", 2)
+	if len(source) == 2 {
+		source = strings.Split(source[1], ",")
+		return source[0]
+	}
+	return ""
+}
+
+// findUser looks for a query user in the QueryTags.
+func findUser(tags string) string {
+	user := strings.SplitN(tags, "user=", 2)
+	if len(user) == 2 {
+		user = strings.Split(user[1], ",")
+		return user[0]
+	}
+	return ""
+}
+
 // Exec Implements `Query`. It handles instrumentation & defers to Eval.
 func (q *query) Exec(ctx context.Context) (logqlmodel.Result, error) {
 	sp, ctx := opentracing.StartSpanFromContext(ctx, "query.Exec")
@@ -240,11 +266,15 @@ func (q *query) Exec(ctx context.Context) (logqlmodel.Result, error) {
 	)
 
 	if q.logExecQuery {
+		// check for a query source
+		tags := httpreq.ExtractQueryTagsFromContext(ctx)
+		source := findSource(tags)
+		user := findUser(tags)
 		queryHash := util.HashedQuery(q.params.QueryString())
 		if GetRangeType(q.params) == InstantType {
-			level.Info(logutil.WithContext(ctx, q.logger)).Log("msg", "executing query", "type", "instant", "query", q.params.QueryString(), "query_hash", queryHash)
+			level.Info(logutil.WithContext(ctx, q.logger)).Log("msg", "executing query", "type", "instant", "query", q.params.QueryString(), "query_hash", queryHash, "source", source, "user", user)
 		} else {
-			level.Info(logutil.WithContext(ctx, q.logger)).Log("msg", "executing query", "type", "range", "query", q.params.QueryString(), "length", q.params.End().Sub(q.params.Start()), "step", q.params.Step(), "query_hash", queryHash)
+			level.Info(logutil.WithContext(ctx, q.logger)).Log("msg", "executing query", "type", "range", "query", q.params.QueryString(), "length", q.params.End().Sub(q.params.Start()), "step", q.params.Step(), "query_hash", queryHash, "source", source, "user", user)
 		}
 	}