feedmessage_matching_time_seconds metric: summary -> gauge 💥

Author: derhuerst

lib/match.js

@@ -1,6 +1,6 @@
 import {cpus as osCpus} from 'node:os'
 import {ok, strictEqual} from 'node:assert'
-import {Summary} from 'prom-client'
+import {Gauge} from 'prom-client'
 import pLimit from 'p-limit'
 import gtfsRtBindings from './mta-gtfs-realtime.pb.js'
 import {connectToPostgres} from './db.js'
@@ -44,7 +44,7 @@ const parseEncodedFeed = (feedEncoded) => {
 	return feedMessage
 }
 
-const _matchingTimeSeconds = new Summary({
+const _matchingTimeSeconds = new Gauge({
 	name: 'feedmessage_matching_time_seconds',
 	help: 'time needed to match an entire FeedMessage with the GTFS Schedule data',
 	registers: [metricsRegister],
@@ -146,7 +146,7 @@ const createParseAndProcessFeed = (cfg) => {
 		const t0 = performance.now()
 		await Promise.all(feedMessage.entity.map(queueFeedEntityMatching))
 		const matchingTime = (performance.now() - t0) / 1000
-		_matchingTimeSeconds.observe({
+		_matchingTimeSeconds.set({
 			'schedule_feed_digest': scheduleFeedDigestSlice,
 		}, matchingTime)
 		_logger.debug({