Investiguate execution queue consumption by the Scheduler

[loicmathieu]

The Scheduler consumes the execution queue for reporting only.
It uses it to know when a trigger should have started an execution but the execution is not already started to be able to emit a WARNING.

As consuming the execution queue is costly, we may revisit this implementation and the cost/benefit balance.

[Malaydewangan09]

Would a periodic check (e.g., every minute) for missed trigger executions be acceptable instead of continuous queue consumption? This could significantly reduce the system load while still maintaining the warning functionality.

[loicmathieu]

We need to discuss this internally before to know what we want to do.
We may remove it or check it periodically.

[Malaydewangan09]

Okay @loicmathieu