A recent update to Google Tag Manager introduced container notifications. By subscribing to container notifications, your Google Tag Manager login email address can be configured to receive an email for some of the key workflows in Google Tag Manager: containers getting published, and containers being submitted for approval (Tag Manager 360 only), for example. Be sure to check out the official help center article about container notifications. In this article, I’ll walk you through the feature and share a couple of tips on how to make it even more useful!
When you create a Server container in Google Tag Manager, GTM creates an App Engine deployment in the Google Cloud Platform for you. App Engine is a managed serverless platform, which basically means it’s a (set of) virtual machine(s) running in the cloud, with some extra bells and whistles added to make managing it easier. A potentially useful thing that App Engine does is decorate all incoming HTTP requests with some HTTP headers that can be used in the app.
Since the release of Server-side tagging in Google Tag Manager, I’ve jumped at every opportunity to celebrate the tools it provides for improving end-user privacy and data security. One of the biggest benefits is obfuscation-by-default. Since all hits are passed through the server-side proxy, the default view for any third-party tool (such as Google Analytics) is that of the server in the Google Cloud rather than the browser and device with which the user was browsing the site.
Since updating to Google Chrome 83, you might have noticed that Google Tag Manager’s Preview mode no longer works when browsing Chrome in Incognito mode. This is because starting with Chrome 83, third-party cookies are blocked by default in Incognito windows. Google Tag Manager uses third-party cookies to serve browsers in Preview mode with the container draft rather than the live container. There’s a simple workaround to make sure Preview mode continues working for any site you want to browse in Preview mode.
One of the most versatile triggers in Google Tag Manager is the Custom Event trigger. As its name indicates, you can use it to fire your tags when an event is pushed into dataLayer. This process is at the heart of GTM’s dataLayer system. And it’s not just custom events. Every single trigger type in Google Tag Manager uses the event key in a dataLayer.push(), which is why you’ll see events like gtm.
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