add promClient option for smuggling collectDefaultMetrics, upgrade pr…

…om-client to ~10.2.2, version 3.3.0

README.md

@@ -60,6 +60,9 @@ Other options:
 
 * **buckets**: buckets used for `http_request_duration_seconds` histogram
 * **autoregister**: if `/metrics` endpoint should be registered. (Default: **true**)
+* **promClient**: options for promClient startup, e.g. **collectDefaultMetrics**. This option was added
+  to keep `express-prom-bundle` runnable using confit (e.g. with kraken.js) without writing any JS code,
+  see [advanced example](https://github.com/jochen-schweizer/express-prom-bundle/blob/master/advanced-example.js)
 
 Deprecated:
 
@@ -171,19 +174,32 @@ Here is meddleware config sample, which can be used in a standard **kraken.js**
 
 ## Changelog
 
+ * **3.3.0**
+    * added option **promClient** to be able to call collectDefaultMetrics
+    * upgrade **prom-client** to ~10.2.2 (switch to semver "approximately")
+
+
  * **3.2.0**
     * added options **customLabels**, **transformLabels**
     * upgrade **prom-client** to 10.1.0
+
+
  * **3.1.0**
     * upgrade **prom-client** to 10.0.0
+
+
  * **3.0.0**
     * upgrade dependencies, most notably **prom-client** to 9.0.0
     * switch to koa v2 in koa unittest
     * only node v6 or higher is supported (stop supporting node v4 and v5)
     * switch to npm5 and use package-lock.json
     * options added: includeStatusCode, formatStatusCode
+
+
  * **2.1.0**
     * deprecate **excludeRoutes**, use **req.originalUrl** instead of **req.path**
+
+
  * **2.0.0**
     * the reason for the version lift were:
       * compliance to official naming recommendation: https://prometheus.io/docs/practices/naming/

advanced-example.js

@@ -10,13 +10,18 @@ const bundle = promBundle({
   includeMethod: true,
   includePath: true,
   customLabels: {year: null},
-  transformLabels: labels => Object.assign(labels, {year: new Date().getFullYear()})
+  transformLabels: labels => Object.assign(labels, {year: new Date().getFullYear()}),
+  promClient: {
+    collectDefaultMetrics: {
+      timeout: 1000
+    }
+  }
 });
 
 app.use(bundle);
 
 // native prom-client metric (no prefix)
-const c1 = new bundle.promClient.Counter('c1', 'c1 help');
+const c1 = new bundle.promClient.Counter({name: 'c1', help: 'c1 help'});
 c1.inc(10);
 
 app.get('/foo/:id', (req, res) => {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "express-prom-bundle",
-  "version": "3.2.1",
+  "version": "3.3.0",
   "description": "express middleware with popular prometheus metrics in one bundle",
   "main": "src/index.js",
   "keywords": [
@@ -17,7 +17,7 @@
   "license": "MIT",
   "dependencies": {
     "on-finished": "^2.3.0",
-    "prom-client": "^10.1.0",
+    "prom-client": "~10.2.2",
     "url-value-parser": "^1.0.0"
   },
   "devDependencies": {

spec/index.spec.js

@@ -343,4 +343,16 @@ describe('index', () => {
         });
     });
   });
+
+  it('calls promClient.collectDefaultMetrics', () => {
+    const spy = spyOn(promClient, 'collectDefaultMetrics');
+    bundle({
+      promClient: {
+        collectDefaultMetrics: {
+          timeout: 3000
+        }
+      }
+    });
+    expect(spy).toHaveBeenCalledWith({timeout: 3000});
+  });
 });

src/index.js

@@ -44,7 +44,8 @@ function main(opts) {
       autoregister: true,
       includeStatusCode: true,
       normalizePath: main.normalizePath,
-      formatStatusCode: main.normalizeStatusCode
+      formatStatusCode: main.normalizeStatusCode,
+      promClient: {}
     },
     opts
   );
@@ -66,6 +67,10 @@ function main(opts) {
     );
   }
 
+  if (opts.promClient.collectDefaultMetrics) {
+    promClient.collectDefaultMetrics(opts.promClient.collectDefaultMetrics);
+  }
+
   const httpMetricName = opts.httpDurationMetricName || 'http_request_duration_seconds';
 
   const metricTemplates = {