+Per-CPU::
+ Prefix: `perf:cpu:`.
++
+Only available for Linux kernel (option:--kernel option) channels.
+
+Per-thread::
+ Prefix: `perf:thread:`.
++
+Only available for user application/library (option:--userspace,
+option:--jul, and option:--log4j options) channels.
+
+Add PMU counter context fields by raw ID with the
+++perf:cpu:raw:r++__N__++:++__NAME__ (Linux kernel tracing domain) or
+++perf:thread:raw:r++__N__++:++__NAME__ (user space tracing domain)
+types, with:
+
+'N'::
+ A hexadecimal event descriptor which follows the man:perf-record(1)
+ format: a concatenation of the event number and umask value which
+ the manufacturer of the processor provides.
++
+The possible values for this field are processor-specific.
+
+'NAME'::
+ Custom name to easily recognize the counter.
+
+Add an application-specific context field with the following syntax: