From 0079d8634a7dd5ee9c803bcf5ee0f0975388c604 Mon Sep 17 00:00:00 2001
From: Hornwitser <github@hornwitser.no>
Date: Fri, 20 Nov 2020 01:33:46 +0100
Subject: [PATCH] Optimize labelsToKey for single label metrics

Avoid doing an Array.join when there's only one label in labelsToKey.
---
 packages/lib/prometheus.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/lib/prometheus.js b/packages/lib/prometheus.js
index 9a9bda69..aaf34c11 100644
--- a/packages/lib/prometheus.js
+++ b/packages/lib/prometheus.js
@@ -275,6 +275,10 @@ function labelsToKey(labels, metricLabels) {
 		}
 	}
 
+	if (items.length === 1) {
+		return items[0];
+	}
+
 	return items.join(",");
 }