Merge pull request github#18693 from github/fix-hydro-event-tags

hydro: allow grouping of response stats by code

Author: mikesurowiec

lib/hydro.js

@@ -76,8 +76,9 @@ module.exports = class Hydro {
 
     const res = await statsd.asyncTimer(doFetch, 'hydro.response_time')()
 
-    statsd.increment(`hydro.response_code.${res.status}`, 1)
-    statsd.increment('hydro.response_code.all', 1)
+    const statTags = [`response_code:${res.status}`]
+    statsd.increment(`hydro.response_code.${res.status}`, 1, statTags)
+    statsd.increment('hydro.response_code.all', 1, statTags)
 
     // Track hydro exceptions in Sentry, but don't track 503s because we can't do anything about service availability
     if (!res.ok && res.status !== 503) {