Tools: Add Scheduler Plugin Metrics to Dashboards

[danehans]

#677 adds EPP scheduler plugin metrics. The dashboards should be updated accordingly.

[danehans]

@JeffLuoo do you have cycles to fix this issue? If so, please assign yourself.

[JeffLuoo]

@liu-cong Hi Cong, do you have the plan to add scheduler plugin metrics to the dashboard?

[liu-cong]

@liu-cong Hi Cong, do you have the plan to add scheduler plugin metrics to the dashboard?

Not an expert on dashboard. I am not planning to add these metrics

[danehans]

@JeffLuoo now that #677 has been merged, are you able to add scheduler_plugin_duration_seconds to the dashboard? This metric was added to the EPPComponent subsystem instead of InferencePoolComponent or InferenceModelComponent, which may require a new dashboard. I'll add a help wanted label to see if someone in the community can work on this if you cannot.