This PR adds a new [extension point][] to each row of the alert instances table. This allows plugins to add actions to a dropdown menu in the rightmost column of the table. Those actions are passed the alert instance so can use it for contextual handling. See https://github.com/grafana/machine-learning/pull/3461 for an example of how this can be used (e.g. by Grafana Sift here).
Grafana Data Library
@grafana/data is currently in BETA.
This package holds the root data types and functions used within Grafana.