feat: make compatible with latest open telemetry deps

lib/index.js

@@ -1,5 +1,6 @@
 'use strict'
 
+const telemetry = require('@opentelemetry/api-metrics');
 const { PrometheusExporter } = require('@opentelemetry/exporter-prometheus')
 const { MeterProvider } = require('@opentelemetry/sdk-metrics-base')
 const { createHash } = require('crypto')
@@ -41,16 +42,16 @@ const exporter = new PrometheusExporter({ host, port, endpoint, appendTimestamp,
 const meter = new MeterProvider({
     exporter,
     interval
-}).getMeter('logged-in-users', 1)
+})
+meter.addMetricReader(exporter)
 
 let up = 1
 let sessions = {}
-let logins = {}
 
-meter.createObservableGauge('user_sessions_currently_active', {
+meter.getMeter('default').createObservableGauge('user_sessions_currently_active', {
     description: 'Currently logged in users',
     constantLabels: ['user', 'ip']
-}, (observer) => {
+}).addCallback((observer) => {
     if (!sessions) {
         return
     }
@@ -61,18 +62,15 @@ meter.createObservableGauge('user_sessions_currently_active', {
     })
 })
 
-meter.createObservableGauge('up', {
+meter.getMeter('default').createObservableGauge('up', {
     description: 'Health and status of the exporter',
     constantLabels: ['version']
-}, (observer) => {
-
-    observer.observe(up, {
+}).addCallback(observe => {
+    observe.observe(up, {
         version: pkg.version
     })
 })
 
-meter.collect()
-
 const lookup = async () => {
     try {
         const wResult = await w()
@@ -97,8 +95,6 @@ const lookup = async () => {
             }
             sessions[key].push(createHash('sha256').update(JSON.stringify(value)).digest().toString('base64'))
         })
-
-        meter.collect()
     } catch (e) {
         up = 0
         console.log(`Could not gather metrics. Will retry after ${interval} ms`, e)

package.json

@@ -37,9 +37,8 @@
   },
   "homepage": "https://github.com/stfsy/prometheus-what-active-users-exporter#readme",
   "dependencies": {
-    "@opentelemetry/api": "^1.1.0",
-    "@opentelemetry/exporter-prometheus": "^0.27.0",
-    "@opentelemetry/sdk-metrics-base": "^0.27.0",
+    "@opentelemetry/exporter-prometheus": "^0.30.0",
+    "@opentelemetry/sdk-metrics-base": "^0.30.0",
     "http-graceful-shutdown": "^3.1.7"
   },
   "devDependencies": {