Healthchecks.io recently got a new feature: run IDs. Run IDs are client-chosen UUID values that the client can optionally add as a “rid” query parameter to any ping URL (success, /start, /fail, /log, /{exitcode}). What are run IDs useful for? Healthchecks.io uses them to group events from a single “run”, and calculate correct run durations. This is most important in cases where multiple instances of the same job can run simultaneously, and partially or fully overlap.