Application Insights–Use a different instrumentation key per environment

By default when you configure Application Insights, the Instrumentation key is hardcoded in the JavaScript snippet

and the ApplicationInsights.config:

This makes it very hard to integrate your application into your devops pipeline and use different instrumentation keys for different environments(development, test, production).

Let’s see how we can fix this:

• Start by commenting out the InstrumentationKey setting in the ApplicationInsights.config:

• Instead add an extra appsetting to your web. config. By using the web.config you can use the web.config transformations to inject different instrumentation keys for different environments.

• Now we have to tell Application Insights to use the key specified in our web.config. Therefore add the following line of code to the Application_Start method of the global.asax:

	protected void Application_Start()
	{
	TelemetryConfiguration.Active.InstrumentationKey = WebConfigurationManager.AppSettings["InstrumentationKey"];
	RegisterRoutes(RouteTable.Routes);
	AreaRegistration.RegisterAllAreas();
	}

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• As a last step we also have to fix this for the JavaScript snippet injected into our page:

	<script type="text/javascript">
	var appInsights = window.appInsights || function (a) {
	function b(a) { c[a] = function () { var b = arguments; c.queue.push(function () { c[a].apply(c, b) }) } } var c = { config: a }, d = document, e = window; setTimeout(function () { var b = d.createElement("script"); b.src = a.url || "https://az416426.vo.msecnd.net/scripts/a/ai.0.js", d.getElementsByTagName("script")[0].parentNode.appendChild(b) }); try { c.cookie = d.cookie } catch (a) { } c.queue = []; for (var f = ["Event", "Exception", "Metric", "PageView", "Trace", "Dependency"]; f.length;)b("track" + f.pop()); if (b("setAuthenticatedUserContext"), b("clearAuthenticatedUserContext"), b("startTrackEvent"), b("stopTrackEvent"), b("startTrackPage"), b("stopTrackPage"), b("flush"), !a.disableExceptionTracking) { f = "onerror", b("_" + f); var g = e[f]; e[f] = function (a, b, d, e, h) { var i = g && g(a, b, d, e, h); return !0 !== i && c["_" + f](a, b, d, e, h), i } } return c
	}({
	instrumentationKey:"@Microsoft.ApplicationInsights.Extensibility.TelemetryConfiguration.Active.InstrumentationKey"
	});
	window.appInsights = appInsights, appInsights.queue && 0 === appInsights.queue.length && appInsights.trackPageView();
	</script>

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