chore: add metric sample and update READMEs throughout

packages/opentelemetry-cloud-monitoring-exporter/README.md

@@ -9,27 +9,37 @@ OpenTelemetry Google Cloud Monitoring Exporter allows the user to send collected
 ## Installation
 
 ```bash
-npm install --save @opentelemetry/sdk-metrics-base
+npm install --save @opentelemetry/sdk-metrics
 npm install --save @google-cloud/opentelemetry-cloud-monitoring-exporter
 ```
 
 ## Usage
 
 ```js
-const { MeterProvider }  = require('@opentelemetry/sdk-metrics-base');
-const { MetricExporter } = require('@google-cloud/opentelemetry-cloud-monitoring-exporter');
-
-const exporter = new MetricExporter();
+const { MeterProvider, PeriodicExportingMetricReader } = require("@opentelemetry/sdk-metrics");
+const { MetricExporter } = require("@google-cloud/opentelemetry-cloud-monitoring-exporter");
 
+// Create MeterProvider
+const meterProvider = new MeterProvider();
 // Register the exporter
-const meter = new MeterProvider({
-  exporter,
-  interval: 60000,
-}).getMeter('example-meter');
+meterProvider.addMetricReader(
+  new PeriodicExportingMetricReader({
+    exportIntervalMillis: 10_000,
+    exporter: new MetricExporter(),
+  })
+);
+
+// Create a meter
+const meter = meterProvider.getMeter("metrics-sample");
 
 // Now, start recording data
-const counter = meter.createCounter('metric_name');
-counter.add(10, { [key]: 'value' });
+const counter = meter.createCounter("metric_name");
+counter.add(10, { key: "value" });
+
+// Wait for the metric to be exported
+new Promise((resolve) => {
+  setTimeout(resolve, 11_000);
+});
 ```
 
 ##  Viewing your metrics:

samples/metrics/README.md

@@ -0,0 +1,38 @@
+# Overview
+
+This example shows how to use [@opentelemetry/sdk-metrics](https://github.com/open-telemetry/opentelemetry-js/tree/main/packages/opentelemetry-sdk-metrics) to instrument a simple Node.js application and export metrics to [Google Cloud Monitoring](https://cloud.google.com/monitoring/).
+
+## Installation
+
+```sh
+$ # from root of repo, build all packages
+$ npm install
+```
+
+## Run the Application
+
+```sh
+$ # from this directory
+$ npm start
+```
+
+## View metrics
+
+https://console.cloud.google.com//monitoring/metrics-explorer?project=your-project-id
+
+1. Select the Metric from the dropdown. You should see it under the resource "Generic Task":
+
+   <img width="1584" alt="choose metric type" src="images/choose-metric-type.png?raw=true"/>
+
+2. View the timeseries:
+
+   <img width="1584" alt="view timeseries" src="images/metric-timeseries.png?raw=true"/>
+
+
+## Useful links
+- For more information on OpenTelemetry, visit: <https://opentelemetry.io/>
+- For more information on metrics, visit: <https://opentelemetry.io/docs/concepts/signals/metrics/>
+
+## LICENSE
+
+Apache License 2.0

samples/metrics/index.js

@@ -0,0 +1,36 @@
+const {
+  MeterProvider,
+  PeriodicExportingMetricReader,
+} = require("@opentelemetry/sdk-metrics");
+const { Resource } = require("@opentelemetry/resources");
+const {
+  MetricExporter,
+} = require("@google-cloud/opentelemetry-cloud-monitoring-exporter");
+
+// Create MeterProvider
+const meterProvider = new MeterProvider({
+  resource: new Resource({
+    "service.name": "example-metric-service",
+    "service.namespace": "samples",
+    "service.instance.id": "12345",
+  }),
+});
+// Register the exporter
+meterProvider.addMetricReader(
+  new PeriodicExportingMetricReader({
+    exportIntervalMillis: 10_000,
+    exporter: new MetricExporter(),
+  })
+);
+
+// Create a meter
+const meter = meterProvider.getMeter("metrics-sample");
+
+// Now, start recording data
+const counter = meter.createCounter("metric_name");
+counter.add(10, { key: "value" });
+
+// Wait for the metric to be exporter
+new Promise((resolve) => {
+  setTimeout(resolve, 10_000);
+});