be compatible with the infra-wide setting for metrics port

[gvelez17]

Enable Prometheus Scraping of Metrics - #INFRA-14

Description

The historical environment variable is METRICS_PORT, across different node types. Better to be consistent.

This will allow us to turn on prometheus endpoint to be scraped on cas.

How Has This Been Tested?

Describe the tests that you ran to verify your changes. Provide instructions for reproduction.

• [x ] Unit tests

Definition of Done

Before submitting this PR, please make sure:

• [ x] The work addresses the description and outcomes in the issue
• I have added relevant tests for new or updated functionality
• My code follows conventions, is well commented, and easy to understand
• [x ] My code builds and tests pass without any errors or warnings
• [x ] I have tagged the relevant reviewers
• I have updated the READMEs of affected packages
• I have made corresponding changes to the documentation
• [ x] The changes have been communicated to interested parties

References:

Please list relevant documentation (e.g. tech specs, articles, related work etc.) relevant to this change, and note if the documentation has been updated.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2061e07) 81.57% compared to head (a3f4ce7) 81.57%.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1177   +/-   ##
========================================
  Coverage    81.57%   81.57%           
========================================
  Files           46       46           
  Lines         1802     1802           
  Branches       276      276           
========================================
  Hits          1470     1470           
  Misses         332      332           

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[3benbox]

lgtm