pmLoadDerivedConfig - load derived metric definitions from a file
int pmLoadDerivedConfig(char *fname)
cc ... -lpcp
Each line of the file fname is either a comment line (with a ‘‘#’’ in
the first position of the line) or the declaration of a derived
performance metric, specified as:
* the name of the derived metric, using the same ‘‘dot notation’’
syntax that is used for PCP performance metrics, see PCPIntro(1) and
* an equals sign (‘‘=’’)
* a valid expression for a derived metric, as described in
White space is ignored in the lines.
For each line containing a derived metric definition, BR
pmRegisterDerived (3) is called to register the new derived metric.
The result from pmLoadDerivedConfig will be the number of derived
metrics loaded from fname else a value less than zero in the case of an
# sample derived metric definitions
bad_in_pkts = network.interface.in.errors + network.interface.in.drops
# note the following would need to be on a single line ...
disk.dev.read_pct = 100 * delta(disk.dev.read) /
(delta(disk.dev.read) + delta(disk.dev.write))
PCPIntro(1), PMAPI(3) and pmRegisterDerived(3).