[feat][broker] Support dynamic update log level at runtime

[ethqunzhong]

Motivation

As default, Broker log level set by log4j2.yaml with pulsar.log.level=info, if developers want to update log level to debug, need to Modify log42j.yaml#pulsar.log.level=debug and then restart Broker service.

This PR support developers dynamic update Broker log level at runtime,It is very useful for online trouble shooting without having to stop Broker service and start it again.

Modifications

• add admin cli (bin/pulsar-admin brokers update-logger-level --classname ${CLASSNAME} --level ${LEVEL})
• add rest endpoints (/admin/v2/brokers/log4j/{classname}/{level})

Verifying this change

• Make sure that the change passes the CI checks.

• This change added tests and can be verified as follows:org.apache.pulsar.admin.cli.PulsarAdminToolTest#brokers
• works as expected on product environment.

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (no)
• The public API: (no)
• The schema: (no)
• The default values of configurations: (no)
• The wire protocol: (no)
• The rest endpoints: (yes)
• The admin cli options: (yes)
• Anything that affects deployment: (no)

Documentation

• [x] doc-not-needed

[wolfstudy]

cc @eolivelli @Jason918 PTAL again thanks

[ethqunzhong]

/pulsarbot run-failure-checks

[ethqunzhong]

IIRC log4j supports automatic reloading of configuration files. Isn't it enough for you?

yes, Log4j has the ability to automatically configure itself during initialization and reload config while config files changed. but it is more convenient for developers update logger level by programmatically way.

[github-actions[bot]]

The pr had no activity for 30 days, mark with Stale label.

[github-actions[bot]]

The pr had no activity for 30 days, mark with Stale label.

[github-actions[bot]]

@ethqunzhong Please add the following content to your PR description and select a checkbox:

- [ ] `doc` <!-- Your PR contains doc changes -->
- [ ] `doc-required` <!-- Your PR changes impact docs and you will update later -->
- [ ] `doc-not-needed` <!-- Your PR changes do not impact docs -->
- [ ] `doc-complete` <!-- Docs have been already added -->

[codecov-commenter]

Codecov Report

Merging #14200 (c94489f) into master (3011946) will increase coverage by 0.26%. The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master   #14200      +/-   ##
============================================
+ Coverage     46.75%   47.01%   +0.26%     
+ Complexity    10514     9323    -1191     
============================================
  Files           703      623      -80     
  Lines         68858    59132    -9726     
  Branches       7383     6148    -1235     
============================================
- Hits          32193    27800    -4393     
+ Misses        33065    28309    -4756     
+ Partials       3600     3023     -577     

Flag	Coverage Δ
unittests	47.01% <0.00%> (+0.26%)	:arrow_up:

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

Impacted Files	Coverage Δ
...g/apache/pulsar/broker/admin/impl/BrokersBase.java	55.28% <0.00%> (-6.54%)	:arrow_down:
.../pulsar/broker/service/SharedConsumerAssignor.java	3.70% <0.00%> (-74.08%)	:arrow_down:
...java/org/apache/pulsar/proxy/stats/TopicStats.java	58.82% <0.00%> (-41.18%)	:arrow_down:
...apache/pulsar/broker/service/EntryAndMetadata.java	0.00% <0.00%> (-40.75%)	:arrow_down:
...ersistentStickyKeyDispatcherMultipleConsumers.java	46.07% <0.00%> (-14.71%)	:arrow_down:
.../apache/pulsar/broker/admin/impl/PackagesBase.java	54.12% <0.00%> (-13.77%)	:arrow_down:
...ervice/persistent/MessageRedeliveryController.java	56.09% <0.00%> (-12.20%)	:arrow_down:
...e/pulsar/broker/service/EntryBatchIndexesAcks.java	82.14% <0.00%> (-10.72%)	:arrow_down:
...sistent/PersistentDispatcherMultipleConsumers.java	50.34% <0.00%> (-8.51%)	:arrow_down:
...balance/impl/SimpleResourceAllocationPolicies.java	48.57% <0.00%> (-5.72%)	:arrow_down:
... and 108 more

[poorbarcode]

Since we will start the RC version of 3.0.0 on 2023-04-11, I will change the label/milestone of PR who have not been merged.

• The PR of type feature is deferred to 3.1.0
• The PR of type fix is deferred to 3.0.1

So drag this PR to 3.1.0