3. A **log level** (each instrumentation point declares its own log
level) or log level range to match (optional; only valid for user
space domain).
4. A **custom user expression**, or **filter**, that must evaluate to
3. A **log level** (each instrumentation point declares its own log
level) or log level range to match (optional; only valid for user
space domain).
4. A **custom user expression**, or **filter**, that must evaluate to