[FLINK-25697][Runtime / Metrics] introduce port url config for prometheus push gateway a…

[mas-chen]

…nd deprecate host/port configs

What is the purpose of the change

Support scheme specification in Prometheus Push Gateway Reporter

Brief change log

• Introduce new host url config that unifies scheme, host, and port specification
• Deprecate host and port configs

Verifying this change

This change added tests and can be verified as follows:

• Added unit tests to verify the final Prometheus Push Gateway URL

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? no
• If yes, how is the feature documented? docs

[flinkbot]

CI report:

• 79448e6 Azure: SUCCESS

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Automated Checks

Last check on commit 9b618d7 (Tue Feb 08 18:22:27 UTC 2022)

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• ❓ 1. The [description] looks good.
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[zentol]

The prometheus reporter documentation contains an example config that also needs an update.

[zentol]

@flinkbot run azure