[YUNIKORN-647] Add new metrics to monitor pending applications: "long_pending_app"

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Component/s: core - common
• Target Version: 0.11
• Assignee: Chenya Zhang
• Reporter: Chenya Zhang
• Created: 21/Apr/21 00:30
• Updated: 25/May/21 19:29
• Resolved: 25/May/21 19:29

Description

Based on our observation, if there is one application pending for more than a threshold (e.g. 10 minutes), the scheduler is likely down.

We would like to capture it for more timely alerting.