Figure out a way to track job queueing time
We need to find a way to track how long builds for each namespace that are pending are being enqueued. We are trying to fulfill here following requirements:
- there's at least one job running for each project,
- if there's nothing running, but enqueued, what is the delay between next runs.
So we are trying to figure out the times when a project doesn't have any job running but has pending ones.