fix: Make sure that Playout Gateway never puts an object into the message field of the JSONL log output (SOFIE-3679)

[jstarpl]

About the Contributor

This pull request is posted on behalf of the NRK.

Type of Contribution

This is a:

Bug fix

Current Behavior

Sometimes, Playout Gateway outputs an object as the "message" member of the JSONL-formated logging output to std streams.

New Behavior

Message is ensured not to be an object.

Testing

• I have added one or more unit tests for this PR
• I have updated the relevant unit tests
• No unit test changes are needed for this PR

Affected areas

• This PR affects logging

Time Frame

• We intend to finish the development on this feature in two weeks time.

Other Information

Status

• PR is ready to be reviewed.
• The functionality has been tested by the author.
• Relevant unit tests has been added / updated.
• Relevant documentation (code comments, system documentation) has been added / updated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.00%. Comparing base (d2a3cdf) to head (0d2b844).

Additional details and impacted files

@@              Coverage Diff              @@
##           release51    #1353      +/-   ##
=============================================
+ Coverage      57.96%   58.00%   +0.04%     
=============================================
  Files            525      525              
  Lines          85164    85164              
  Branches        4428     4464      +36     
=============================================
+ Hits           49362    49399      +37     
+ Misses         35798    35732      -66     
- Partials           4       33      +29     

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