Support to modify the log level key name in the cadence

[git-hulk]

Q	A
Bug fix?	no
New feature?	yes
API breaks?	no
Deprecations?	no
Related tickets	no
License	Apache 2.0

What's in this PR?

Support to modify the log level key name in the cadence

Why?

The log level key was used to identify which field in the log JSON was represented the log level and regard the log as ERROR level when the log level key was not found, so we want to have a way to change log level key(default was "level").

Checklist

• Code meets the Developer Guide
• User guide and development docs updated (if needed)
• Related Helm chart(s) updated (if needed)

[pregnor]

LGTM

Do you require an immediate release of this, or is it enough if we add it to the next "scheduled" release? (expected in the coming weeks)

[git-hulk]

Many thanks to @pregnor, it's enough in the next release since we can workaround with local charts and use the remote repo agnain after releasing.

[sagikazarmark]

LGTM

[pregnor]

@git-hulk I hope it is okay if we are going to rebase the PR to the latest master state and also push a chart patch version bump commit before merging. It is easier and faster for us to release a patch version this way.

@akijakya is going to do these changes and the release in the coming hours.

[git-hulk]

Many thanks to @pregnor, we have patched the change on our local version, and works fine now. Would switch to the community version again after release.

[akijakya]

Hi @git-hulk!

The new chart version 0.22.1 has been released containing this change. You can pull the new chart after updating your local Helm repository index.

Note that the server version has also been bumped in the meantime 0.21->0.22.