[FEATURE] Postpone / delay escalation chain start when nobody is on call

[bmalynovytch]

What would you like to see!

When nobody is on call, allow delaying of escalation chains.

Use case is when team is off duty (see #4845), users need to be notified when they come back.

Product Area

Schedules

Anything else to add?

No response

[github-actions[bot]]

The current version of Grafana OnCall, at the time this issue was opened, is v1.9.1. If your issue pertains to an older version of Grafana OnCall, please be sure to list it in the PR description. Thank you :smile:!

[parthy]

This would be extremely helpful. I have a use case where there are specified service hours and any alert outside of those should be queued and delivered to the next person on call.