Service Metrics - Availability uptime and downtime

[fhibf]

Description

Emitting availability uptime and downtime based on the response of health checks.

Related issues

Addresses AB#197037

Testing

Describe how this change was tested.

FHIR Team Checklist

• Update the title of the PR to be succinct and less than 65 characters
• Add a milestone to the PR for the sprint that it is merged (i.e. add S47)
• Tag the PR with the type of update: Bug, Build, Dependencies, Enhancement, New-Feature or Documentation
• Tag the PR with Open source, Azure API for FHIR (CosmosDB or common code) or Azure Healthcare APIs (SQL or common code) to specify where this change is intended to be released.
• Tag the PR with Schema Version backward compatible or Schema Version backward incompatible or Schema Version unchanged if this adds or updates Sql script which is/is not backward compatible with the code.
• When changing or adding behavior, if your code modifies the system design or changes design assumptions, please create and include an ADR.
• CI is green before merge
• Review squash-merge requirements

Semver Change (docs)

Patch|Skip|Feature|Breaking (reason)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.56%. Comparing base (fab0817) to head (aaeb7be).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5665      +/-   ##
==========================================
- Coverage   77.56%   77.56%   -0.01%     
==========================================
  Files        1004     1005       +1     
  Lines       36924    36943      +19     
  Branches     5600     5601       +1     
==========================================
+ Hits        28641    28653      +12     
- Misses       6926     6929       +3     
- Partials     1357     1361       +4     

see 13 files with indirect coverage changes

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