add fpc load balancer metrics

[bdoyle0182]

Description

Add missing load balancer metrics that previously existed in the old scheduler. Since there is no longer a concept of managed / blackbox to the load balancer, some of the metrics are just all encompassing now and not differentiated by invoker type. This is useful to see how large your invoker fleet currently is that's healthy and unhealthy without having to hit the controller's invoker endpoint and emitting your own status externally. Also added in the completion ack metrics which were also missing

Related issue and scope

• I opened an issue to propose and discuss this change ([New Scheduler] Existing Load Balancer Metrics Do Not Emit On FPCPoolBalancer #5231)

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 #5240 (d3a6a9a) into master (3e3414c) will increase coverage by 29.82%.
The diff coverage is 40.90%.

@@             Coverage Diff             @@
##           master    #5240       +/-   ##
===========================================
+ Coverage   44.53%   74.36%   +29.82%     
===========================================
  Files         238      238               
  Lines       13957    13990       +33     
  Branches      570      569        -1     
===========================================
+ Hits         6216    10403     +4187     
+ Misses       7741     3587     -4154     

Impacted Files	Coverage Δ
.../openwhisk/core/loadBalancer/FPCPoolBalancer.scala	32.95% <27.77%> (-0.79%)	⬇️
...in/scala/org/apache/openwhisk/common/Logging.scala	79.01% <100.00%> (+4.01%)	⬆️
...whisk/connector/kafka/KafkaConsumerConnector.scala	59.15% <0.00%> (-22.54%)	⬇️
.../scala/org/apache/openwhisk/utils/Exceptions.scala	20.00% <0.00%> (-20.00%)	⬇️
...whisk/connector/kafka/KafkaProducerConnector.scala	60.97% <0.00%> (-19.03%)	⬇️
...pache/openwhisk/core/invoker/InvokerReactive.scala	54.33% <0.00%> (-18.90%)	⬇️
...apache/openwhisk/core/ack/MessagingActiveAck.scala	58.33% <0.00%> (-8.34%)	⬇️
.../core/scheduler/container/CreationJobManager.scala	83.07% <0.00%> (-0.26%)	⬇️
...sk/core/scheduler/container/ContainerManager.scala	88.60% <0.00%> (-0.12%)	⬇️
... and 140 more

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