pmiaddmetric(3)

NAME

   pmiAddMetric - add a new metric definition to a LOGIMPORT context

C SYNOPSIS

   #include <pcp/pmapi.h>
   #include <pcp/impl.h>
   #include <pcp/import.h>

   int pmiAddMetric(const char *name, pmID pmid, int type, pmInDom indom,
           int sem, pmUnits units);

   cc ... -lpcp_import -lpcp

Perl SYNOPSIS

   use PCP::LogImport;

   pmiAddMetric($name, $pmid, $type, $indom, $sem, $units);

DESCRIPTION

   As part of the Performance Co-Pilot Log Import API (see  LOGIMPORT(3)),
   pmiAddMetric  is  used  to define a new metric.  The metric's name must
   follow the naming conventions described in PCPIntro(1)  and  should  be
   unique for each LOGIMPORT context.

   The  other  arguments  are  in effect the fields of a pmDesc structure.
   Refer to pmLookupDesc(3) for a complete description of the  values  and
   semantics  of  the  components  of  this structure, and hence the valid
   argument values for pmiAddMetrics.

   The internal identifier for the metric may  be  given  using  the  pmid
   argument  and must be unique for each LOGIMPORT context.  The value for
   pmid which would typically be constructed using the  pmid_build  macro,
   e.g.  pmid_build(PMI_DOMAIN,  0,  3)  for  the  fourth  metric in first
   ``cluster'' of metrics in the  Performance  Metrics  Domain  PMI_DOMAIN
   (which  is  the  default  for  all  meta  data created by the LOGIMPORT
   library).  Alternatively, pmid may be PM_IN_NULL and pmiAddMetric  will
   assign  a  unique pmid (although this means the pmid remains opaque and
   the application must use  pmiPutValue(3)  or  pmiPutValueHandle(3)  and
   cannot use pmiPutResult(3) to add data values to the PCP archive).

   type  defines  the  data  type  of  the  metric  and must be one of the
   PM_TYPE_...  values defined in <pcp/import.h>.

   The instance domain for the metric is  defined  by  indom  and  may  be
   PM_INDOM_NULL  for  a  metric with a singular value, else the value for
   indom would normally be constructed using the pmInDom_build macro, e.g.
   pmInDom_build(LOGIMPORT,0)   for  the  first  instance  domain  in  the
   Performance Metrics Domain LOGIMPORT (which is the default for all meta
   data created by the LOGIMPORT library).  Multiple metrics can share the
   same instance domain if  they  have  values  for  a  similar  (or  more
   usually, identical) set of instances.

   The  semantics  of  the  metric (counter, instantaneous value, etc.) is
   specified by the sem argument which would normally be the result  of  a
   call to the convenience constructor method pmiUnits(3).

DIAGNOSTICS

   pmiAddMetric  returns zero on success else a negative value that can be
   turned into an error message by calling pmiErrStr(3).

SEE ALSO

   PCPIntro(1),     LOGIMPORT(3),      pmiErrStr(3),      pmiPutResult(3),
   pmiPutValue(3), pmiPutValueHandle(3), pmiUnits(3) and pmLookupDesc(3).

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