Analytics extensions can track a multitude of metrics, including but not limited to:
1. Open Rate: The percentage of recipients who open your email. 2. Click-Through Rate (CTR): The proportion of recipients who clicked on one or more links in your email. 3. Conversion Rate: The percentage of recipients who took a desired action after clicking through your email. 4. Bounce Rate: The percentage of emails that could not be delivered to the recipient's inbox. 5. Unsubscribe Rate: The percentage of recipients who opt-out from your mailing list after receiving an email.