diff options
Diffstat (limited to 'metrics/multilabelmap.go')
| -rw-r--r-- | metrics/multilabelmap.go | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/metrics/multilabelmap.go b/metrics/multilabelmap.go index 223a55a75..7f5abee44 100644 --- a/metrics/multilabelmap.go +++ b/metrics/multilabelmap.go @@ -104,6 +104,15 @@ func (v *MultiLabelMap[T]) String() string { // WritePrometheus writes v to w in Prometheus exposition format. // The name argument is the metric name. func (v *MultiLabelMap[T]) WritePrometheus(w io.Writer, name string) { + v.mu.RLock() + defer v.mu.RUnlock() + + if len(v.sorted) == 0 { + // Do not print TYPE and HELP if we don't actually have any variables + // in the map. + return + } + if v.Type != "" { io.WriteString(w, "# TYPE ") io.WriteString(w, name) @@ -118,8 +127,6 @@ func (v *MultiLabelMap[T]) WritePrometheus(w io.Writer, name string) { io.WriteString(w, v.Help) io.WriteString(w, "\n") } - v.mu.RLock() - defer v.mu.RUnlock() for _, kv := range v.sorted { io.WriteString(w, name) |