update scheduler not processing metric to counter

[bdoyle0182]

Description

This metric unfortunately does not work as a gauge. A gauge will report until there is a change in the value. I previously made a change so that the value would change back to 0 when a new activation is processed. However this does not account for 1. when the queue is stopped before setting the value back to 0 and 2. a queue is moved to a new host before the value is set back to 0 so the value for the action is still emitting 1 until a restart incorrectly reporting.

Related issue and scope

• I opened an issue to propose and discuss this change (#????)

My changes affect the following components

• API
• Controller
• Message Bus (e.g., Kafka)
• Loadbalancer
• Scheduler
• Invoker
• Intrinsic actions (e.g., sequences, conductors)
• Data stores (e.g., CouchDB)
• Tests
• Deployment
• CLI
• General tooling
• Documentation

Types of changes

• Bug fix (generally a non-breaking change which closes an issue).
• Enhancement or new feature (adds new functionality).
• Breaking change (a bug fix or enhancement which changes existing behavior).

Checklist:

• I signed an Apache CLA.
• I reviewed the style guides and followed the recommendations (Travis CI will check :).
• I added tests to cover my changes.
• My changes require further changes to the documentation.
• I updated the documentation where necessary.

[codecov-commenter]

Codecov Report

Merging #5405 (ccfac09) into master (d84e4ee) will decrease coverage by 1.05%.
The diff coverage is 0.00%.

❗ Current head ccfac09 differs from pull request most recent head 43ba7da. Consider uploading reports for the commit 43ba7da to get more accurate results

@@            Coverage Diff             @@
##           master    #5405      +/-   ##
==========================================
- Coverage   76.69%   75.65%   -1.05%     
==========================================
  Files         240      240              
  Lines       14596    14592       -4     
  Branches      671      666       -5     
==========================================
- Hits        11194    11039     -155     
- Misses       3402     3553     +151     

Impacted Files	Coverage Δ
...e/openwhisk/core/scheduler/queue/MemoryQueue.scala	81.03% <0.00%> (+0.59%)	⬆️

... and 34 files with indirect coverage changes

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