lib/metrics/ZenkoMetrics.ts

@@ -1,19 +1,26 @@
 import promClient from 'prom-client';
 
+const collectDefaultMetricsIntervalMs =
+    process.env.COLLECT_DEFAULT_METRICS_INTERVAL_MS !== undefined ?
+        Number.parseInt(process.env.COLLECT_DEFAULT_METRICS_INTERVAL_MS, 10) :
+        10000;
+
+promClient.collectDefaultMetrics({ timeout: collectDefaultMetricsIntervalMs });
+
 export default class ZenkoMetrics {
-    static createCounter(params: promClient.CounterConfiguration<string>) {
+    static createCounter(params: promClient.CounterConfiguration) {
         return new promClient.Counter(params);
     }
 
-    static createGauge(params: promClient.GaugeConfiguration<string>) {
+    static createGauge(params: promClient.GaugeConfiguration) {
         return new promClient.Gauge(params);
     }
 
-    static createHistogram(params: promClient.HistogramConfiguration<string>) {
+    static createHistogram(params: promClient.HistogramConfiguration) {
         return new promClient.Histogram(params);
     }
 
-    static createSummary(params: promClient.SummaryConfiguration<string>) {
+    static createSummary(params: promClient.SummaryConfiguration) {
         return new promClient.Summary(params);
     }
 
@@ -21,15 +28,11 @@ export default class ZenkoMetrics {
         return promClient.register.getSingleMetric(name);
     }
 
-    static async asPrometheus() {
+    static asPrometheus() {
         return promClient.register.metrics();
     }
 
     static asPrometheusContentType() {
         return promClient.register.contentType;
     }
-
-    static collectDefaultMetrics() {
-        promClient.collectDefaultMetrics();
-    }
 }

package.json

@@ -41,7 +41,7 @@
     "level-sublevel": "~6.6.5",
     "mongodb": "^3.0.1",
     "node-forge": "^0.7.1",
-    "prom-client": "14.2.0",
+    "prom-client": "10.2.3",
     "simple-glob": "^0.2",
     "socket.io": "~2.3.0",
     "socket.io-client": "~2.3.0",

tests/unit/metrics/ZenkoMetrics.spec.js

@@ -65,7 +65,7 @@ describe('ZenkoMetrics', () => {
         assert.strictEqual(ZenkoMetrics.getMetric('does_not_exist'), undefined);
     });
 
-    it('should export metrics in prometheus format', async () => {
+    it('should export metrics in prometheus format', () => {
         const expectedLines = [
             '# HELP gizmo_counter Count gizmos',
             '# TYPE gizmo_counter counter',
@@ -94,9 +94,8 @@ describe('ZenkoMetrics', () => {
             'pet_counter{type="puppy"} 2',
         ];
         const lines = {};
-        const metrics = await ZenkoMetrics.asPrometheus();
-        metrics.split('\n').forEach(line => {
-            lines[line.trimEnd()] = true;
+        ZenkoMetrics.asPrometheus().split('\n').forEach(line => {
+            lines[line.trimRight()] = true;
         });
         expectedLines.forEach(expectedLine => {
             assert.notStrictEqual(

yarn.lock

@@ -5384,10 +5384,10 @@ process-nextick-args@~2.0.0:
   resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-2.0.1.tgz#7820d9b16120cc55ca9ae7792680ae7dba6d7fe2"
   integrity sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==
 
-prom-client@14.2.0:
-  version "14.2.0"
-  resolved "https://registry.yarnpkg.com/prom-client/-/prom-client-14.2.0.tgz#ca94504e64156f6506574c25fb1c34df7812cf11"
-  integrity sha512-sF308EhTenb/pDRPakm+WgiN+VdM/T1RaHj1x+MvAuT8UiQP8JmOEbxVqtkbfR4LrvOg5n7ic01kRBDGXjYikA==
+prom-client@10.2.3:
+  version "10.2.3"
+  resolved "https://registry.yarnpkg.com/prom-client/-/prom-client-10.2.3.tgz#a51bf21c239c954a6c5be4b1361fdd380218bb41"
+  integrity sha512-Xboq5+TdUwuQtSSDRZRNnb5NprINlgQN999VqUjZxnLKydUNLeIPx6Eiahg6oJua3XBg2TGnh5Cth1s4I6+r7g==
   dependencies:
     tdigest "^0.1.1"