From b2a06d5e733d95998e622e6df1848923091c7e73 Mon Sep 17 00:00:00 2001
From: pur <pur@wo.ko>
Date: Mon, 2 Nov 2020 11:55:04 +0700
Subject: [PATCH] set buckets as optional in histogram

---
 lib/common/prom.utils.ts | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/common/prom.utils.ts b/lib/common/prom.utils.ts
index 871fe1e..e082f30 100644
--- a/lib/common/prom.utils.ts
+++ b/lib/common/prom.utils.ts
@@ -76,12 +76,15 @@ export function findOrCreateMetric({
       if (metric && metric instanceof client.Histogram) {
         return metric;
       }
-      return new client.Histogram({
+      const histogramConfig = {
         name: name,
         help: help || `${name} ${type}`,
         labelNames,
-        buckets,
-      });
+      };
+      if (buckets) {
+        histogramConfig['buckets'] = buckets;
+      }
+      return new client.Histogram(histogramConfig);
     case "Summary":
       if (metric && metric instanceof client.Summary) {
         return metric;