Migrate `epics_deepest_relationship_level` to instrumentation class
The epics_deepest_relationship_level
metric as it's currently instrumented is not hardened and is at risk of causing the service ping report generation to fail entirely.
Proposal
Move the broken epics_deepest_relationship_level
metric to instrumentation class in order to provide error handling which will allow the metric collection to fail without impacting the entire service ping generation.