This adds an "operation" label to the user metrics and moves incrementing from the manager to api, so that the user metrics show when resources are allocated, as well as destroyed. Previously, user metrics were only updated upon destroying a resource.
I think its better suited to increment the metric as part of the api instead of the pool_manger, because it's expected to do so when a user successfully checks out or deletes a VM, but can be problematic when doing so in the provider since it can clone VMs before actually being checked out by a user.
Introducing the Prometheus Stats code into ABS showed that the Clarity
could be improved a bit with better variable naming, some refactoring
to reduce repitition and documenting the Metrics table itself.
Filtering these changes back to the vmpooler code base.
Ensure that the correct stats are registered for the Manager and the api
respectively. E.g. all checkout counters are for the api only, whereas
clone times belong to the manager.
Also new ondemand functionality stats weren't registered, so add these
along with missing delete stats.
Review changes suggested to revise the Metrics related files into a more
logical class structure.
Also fixup grammar typos in docs strings and any trailing metrics that
have been recently added to vmpooler.
Break down the usage stats into smaller groups so as to manage the
number of stat lines collected for Prometheus.
This may need some further revision to filter out Litmus stats, or
otherwise collect litmus usage information.
Need the logger code in promstats.rb so move logger initialisation to
the top of the vmpooler script, remove the class method from vmpooler.rb
and make appropriate downstream changes to metrics and pooler manger
handling.
This also means we can start decent logging in the API if we wish do.
Fixed up to rebase on top of Matts POOLER-158 changes
This is a re-architect of the vmpooler initialisation code to:
1. Allow an API service for both manager and the api
2. Add the Prometheus endpoints to the web service.
Needed to change the way the Rack Service is started as instantiating
using ".New" leads to a failure to initialise the http Stats
collection.
3. Selectively load the pooler api and/or Prometheus endpoints.
4. Rework API Spec tests for revised API loading. Needed to tidy up the
initialisation and perform a reset! after each test to avoid "leaks"
and dependencies between the tests.
Add a new Prometheus class as an additional stats feed along with the
existing feeds.
Move the metrics initialisation code into its own class and sub-class
the individual metrics implementations under this.
