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NAME | C SYNOPSIS | DESCRIPTION | DIAGNOSTICS | SEE ALSO | COLOPHON |
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PMSERIESDESCS(3) Library Functions Manual PMSERIESDESCS(3)
pmSeriesDescs, pmSeriesLabels, pmSeriesLabelValues,
pmSeriesInstances, pmSeriesMetrics, pmSeriesSources - fast,
scalable time series metadata
#include <pcp/pmwebapi.h>
int pmSeriesDescs(pmSeriesSettings *sp, int count, sds *series,
void *arg);
int pmSeriesLabels(pmSeriesSettings *sp, int count, sds *series,
void *arg);
int pmSeriesLabelValues(pmSeriesSettings *sp, int count, sds
*labels, void *arg);
int pmSeriesInstances(pmSeriesSettings *sp, int count, sds
*series, void *arg);
int pmSeriesMetrics(pmSeriesSettings *sp, int count, sds *series,
void *arg);
int pmSeriesSources(pmSeriesSettings *sp, int count, sds *series,
void *arg);
cc ... -lpcp_web
Each performance metric and data source forming part of the Per‐
formance Co-Pilot (PCP) fast, scalable time series service has
certain properties (metadata) associated with it. These proper‐
ties can be queried using the interfaces described here.
This functionality is provided through asynchronous APIs, which
function in an event-driven fashion where callbacks are invoked
for each metadata structure being returned.
As a general pattern, all interfaces in these APIs that need to
invoke callbacks provided by the calling program (see
pmSeriesSetup(3)) will take an opaque (void * pointer) parameter,
arg. This pointer will be passed through unchanged and is typi‐
cally used to access a data structure maintaining state within
the calling program.
With a couple of exceptions, these interfaces tend to operate in
one of two modes. Firstly, one invocation is available to query
metadata for a specific (non-zero) count of time series. A sec‐
ond, (zero) count, mode returns all available metadata of that
type, across all time series.
In order to retrieve metric descriptor information for one or
more time series, the pmSeriesDescs interface is used. For each
valid series identifier provided, a callback will be invoked pro‐
viding the metric units, semantics, and type as well as other
identifiers associated with it (pmID, InDom and source identifi‐
er). When this call is issued with a zero value for count, It is
an error to pass a zero or negative value of count into this in‐
terface.
To extract label names and values, the pmSeriesLabels interface
is used. With a non-zero value for count valid series identi‐
fiers, this routine will invoke a callback once for each label
name and once for each label name:value pair, for labels associ‐
ated with those time series. If called with a count of zero,
this interface will return (via the label name callback) all la‐
bel names that have observed to date - not associated with spe‐
cific time series. The pmSeriesLabelValues interface is compara‐
ble to this latter mode, except will return all label values that
have been observed to date for the given array of labels names
(not associated with any specific time series identifiers).
pmSeriesInstances can be used to find metadata about instance do‐
mains and instance identifiers associated with a given (non-zero)
count of time series identifiers. If a zero value is passed for
count then all instance names observed to date will be returned.
pmSeriesMetrics can be used to find metric names associated with
a given (non-zero) count of time series identifiers. If a zero
value is passed for count then all metric names observed to date
will be returned.
pmSeriesSources can be used to find metadata about the source of
metrics - that is, host names and archive file paths. If a zero
value is passed for count then all metric sources observed to
date will be returned.
Where these functions return a status code, this is always zero
on success. On failure a negative PMAPI error code is returned.
pmproxy(1), pmlogger(1), pmseries(1), pmSeriesQuery(3),
pmSeriesSetup(3), PMAPI(3) and PMWEBAPI(3).
This page is part of the PCP (Performance Co-Pilot) project. In‐
formation about the project can be found at ⟨http://www.pcp.io/⟩.
If you have a bug report for this manual page, send it to
pcp@groups.io. This page was obtained from the project's
upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2024-06-14.
(At that time, the date of the most recent commit that was found
in the repository was 2024-06-14.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
Performance Co-Pilot PCP PMSERIESDESCS(3)
Pages that refer to this page: pmseriesquery(3), pmseriessetup(3), pmwebapi(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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