[fix] Key_Shared mode consumption latency when low traffic

[poorbarcode]

Motivation

Without #23226 and #23284, the consumption latency is low, but the consumption latency increases to 1s when the traffic is low.

Consumption latency after an upgrade(3 topics).

histogram_quantile(0.98, sum-by (le, topic) (rate (Message_duration_eventstate_ inbound_latencymin_bucket {kubernetes_namespace-"$(env)"} [$__rate_interval])))

Root cause

Modifications

Change the feature's introduced by #23226 default values to 1ms initial / 10ms max.

Documentation

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• doc-complete

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[lhotari]

The previous solution was burning CPU in a tight loop. Instead of disabling this, the values can be made 100x smaller.

[lhotari]

LGTM with values 1ms initial / 10ms max

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.52%. Comparing base (bbc6224) to head (513498e).
Report is 598 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #23340      +/-   ##
============================================
+ Coverage     73.57%   74.52%   +0.95%     
- Complexity    32624    34431    +1807     
============================================
  Files          1877     1934      +57     
  Lines        139502   144981    +5479     
  Branches      15299    15839     +540     
============================================
+ Hits         102638   108049    +5411     
+ Misses        28908    28658     -250     
- Partials       7956     8274     +318     

Flag	Coverage Δ
inttests	27.85% <100.00%> (+3.27%)	⬆️
systests	24.55% <100.00%> (+0.23%)	⬆️
unittests	73.88% <100.00%> (+1.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...org/apache/pulsar/broker/ServiceConfiguration.java	98.96% <100.00%> (-0.43%)	⬇️
...sistent/PersistentDispatcherMultipleConsumers.java	75.29% <100.00%> (+0.96%)	⬆️

... and 601 files with indirect coverage changes