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).