Query expressions are formed using the pmseries query language
described below, but can be as simple as a metric name.
The following is an example of querying timeseries from all hosts
that match a metric name pattern (globbed):
$ pmseries kernel.all.cpu*
1d7b0bb3f6aec0f49c54f5210885464a53629b60
379db729afd63fb9eff436625bd6c55a7adc5cfd
3dd3b45bb05f96636043e5d58b52b441ce542285
[...]
ed2bf325ff6dc7589ec966698e5404b67252306a
dcb2a032a308b5717bf605ba8f8737e9c6e1ed19
To identify timeseries expression operands, the query language
uses the general syntax:
[metric.name] '{metadata qualifiers}' '[time specification]'
The metric.name component restricts the timeseries query to any
matching PCP metric name (the list of metric names for a PCP
archive or live host is reported by pminfo(1) with no arguments
beyond --host or --archive). The pmseries syntax extends on that
of pminfo and allows for glob(7) based pattern matching within
the metric name. The above describes operands available as the
leaves of pmseries expressions, which may include functions,
arithmetic operators and other features. See the EXPRESSIONS
section below for further details.
