Annotations in Mixpanel serve as contextual comments within a project's timeline, enhancing the understanding of time-series charts by documenting product updates, releases, and changes. This tutorial explores automating the creation of Annotations by integrating data from GitHub's REST API, allowing for greater visibility into how app releases affect specific metrics. Annotations provide a way to document product initiatives alongside user metrics, facilitate collaboration, and act as a changelog to track changes over time. However, the free-form nature of Annotations presents challenges in consistency, correctness, and completeness, which can be mitigated by automating their creation. By using GitHub webhooks and cloud functions, Annotations can be automatically populated in Mixpanel, ensuring they are comprehensive and up-to-date, thereby adding value to Mixpanel's analytics capabilities.