Log entry key/value pairs

Each report item (except for num_requests) has a corresponding key/value pair.

These relationships are described in the tables below using the following syntax:

Key/Value pair	Description
(none)	No specific keys are required
KEY=<string>	Specific key required with no specific value
KEY=<number>	Specific key required with numeric value
KEY=<string>, <string>...	Specific key required with multiple values
KEY1=<string>,KEY2=<string>...	Multiple keys required
KEY=VALUE	Specific key required with specific value
KEY={VALUE1, VALUE2...}	Specific key must equal one of list of values
KEY=<null>	Specific key must NOT be present
KEY!=VALUE	Specific key must NOT equal specific value