metrics/mbserver: quote discriminator, rename label _instance -> _shard

diff --git a/metrics/metricbus/internal/server.go b/metrics/metricbus/internal/server.go
index 8700142fb58a5927062e8a8d897b00264c6b1dff..ba3f78c236c281caef4024f3a9229f5cfbbbb087 100644 (file)
--- a/metrics/metricbus/internal/server.go
+++ b/metrics/metricbus/internal/server.go
@@ -269,7 +269,7 @@ func (s *mbServicer) metricsToString(w http.ResponseWriter, r *http.Request) {
                                fmt.Sprintf("%s=%q", "_host", hostname.Fqdn()),
                        }
                        if service.instance != metricbus.SingletonInstanceDiscriminator {
-                               baseLabelValues = append(baseLabelValues, fmt.Sprintf("%s=%s", "_instance", service.instance))
+                               baseLabelValues = append(baseLabelValues, fmt.Sprintf("%s=%q", "_shard", service.instance))
                        }
 
                        for _, value := range metric.values {