Fix healthcheck endpoints

[ilpianista]

Description

Fixes #1529

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[diemol]

Thank you, @ilpianista!

[kmcrawford]

I have a router that is not responding but the /readyz is still returning a 200 and thus not restarting to fix the issue.

Below is the most common exception in the logs: (I have hours of logs in FINE mode if needed)
Expected to read a START_MAP but instead have: END

[diemol]

I think I asked in the other issue if it was possible to see the full stacktrace of the error.

[kmcrawford]

@diemol There is no smoking gun in the logs, and there is a limit in Github for me to post the logs. Can I send you the logs another method?

[diemol]

OK, seems you are having this issue #1507 and probably this one too #1605