Difference between logged fields in agent and backend lead to confusion

[asachs01]

Expected Behavior

When reviewing logs for the Sensu agent and backend, logged field names should be consistent between the two pieces of software. Ideally, the consistency enables operators to better troubleshoot without having to do some mental gymnastics to know what field is equal to another field.

Current Behavior

When reviewing logs from the agent and backend, there are some inconsistencies between the logged field names, leading to confusion. For example:

Agent	Backend
check	checkname
event_uuid	event_id
entity	entity_name

Possible Solution

Review the logged field names and ensure that they're consistent between agent and backend.

Additional context

Related: #4701