Commits on Aug 18, 2021

1. ui,admission: observability improvements for admission control …

   - Trace statements for latency incurred in admission queues.
   - Certain admission control metrics are now included in the
     overload dashboard. Specifically,
     - Resource bottlenecks can be identified using the
       "KV Admission Slots" and "KV Admission IO Tokens Exhausted
       Duration Per Second" graphs.
     - The rate at which admission control is admitting requests
       is in the "Admission Work Rate" graphs and the corresponding
       delay rate (for all requests) is in
       "Admission Delay Rate". Dividing the latter by the former
       gives the mean admission delay.
     - The 75th percentile delay for those requests that actually
       waited for admission is in the
       "Admission Delay: 75th percentile" graph.
     When admission control is off most of these graphs will be
     empty or zero, and the total KV admission slots will be 1.
   
   Informs cockroachdb#65955
   
   Release note (ui change): admission control metrics are added to
   Overload dashboard.

   

   sumeerbhola committed Aug 18, 2021
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