Piotr Skorupa authored Sep 13, 2023 and Alper Akgun committed Sep 13, 2023

This removes `key_path` attribute from `ServicePingContext` for Redis
metrics and includes the Redis key of that metric in `event_name`
instead.

A helper method `MetricDefinition#to_context` was added to help by
returning a context object with the Redis key preassigned.