I’m working on a project that will programmatically create Google Cloud Run services and I want to be able to dynamically discover these services using Prometheus.

This is one solution.

NOTE Google Cloud Run is the service I’m using, but the principle described herein applies to any runtime service that you’d wish to use.

Why is this challenging? IIUC, it’s primarily because Prometheus has a limited set of plugins for service discovery, see the sections that include _sd_ in Prometheus Configuration documentation. Unfortunately, Cloud Run is not explicitly supported. The alternative appears to be to use file-based discovery but this seems ‘challenging’; it requires, for example, reloading Prometheus on file changes.