[FLINK-33736][Scheduler] Update default value of exponential-delay.max-backoff and exponential-delay.backoff-multiplier

[1996fanrui]

What is the purpose of the change

See FLIP-364: Improve the exponential-delay restart-strategy . This PR includes the subtask1 of FLIP-364.

Brief change log

• [FLINK-33736][Scheduler] Update default value of exponential-delay.max-backoff and exponential-delay.backoff-multiplier

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

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): yes
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? yes
• If yes, how is the feature documented? Java doc and config doc are updated.

[flinkbot]

CI report:

• 6d010a2 Azure: SUCCESS

Bot commands

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• @flinkbot run azure re-run the last Azure build

[1996fanrui]

Hi @RocMarshal , would you mind helping take a look this PR in your free time? Thanks~

The default value of multiplier is updated to 1.5, and it has been voted via this thread[1].

[1] https://lists.apache.org/thread/0b1dcwb49owpm6v1j8rhrg9h0fvs5nkt

[RocMarshal]

Hi, @1996fanrui Thanks for driving this. Great ~
LGTM +1 ! (reviewed based on the discussion thread and the flip page)
And I want to pay tribute to you and all those working in this improvement.

[1996fanrui]

Thanks @RocMarshal for the quick review! Merging~