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Expression: Metric Value

A metric value is addressed by selecting a Group and then selecting the metric inside it.

Syntax

group metric

  • group Selection of a group that contains the metric.
  • metric The name of a metric inside that group. Note that the group and metric are separated by a space.

If the group or metric doesn't exist, the expression will evaluate to an empty value.

Example

Consider a TSData (timestamps omitted) with the following metrics:

com.groupon.requesthandlers.ApiClientsListHandler {
  50thPercentile = 201,
  75thPercentile = 219,
  95thPercentile = 260,
  98thPercentile = 350,
  99thPercentile = 541,
  999thPercentile = 871
}

java.lang.Memory {
  ObjectPendingFinalizationCount = 761,
  Verbose = false
}

And the following metric expressions:

com.groupon.requesthandlers.ApiClientsListHandler '98thPercentile'  # (1)
com.groupon.requesthandlers.ApiClientsListHandler '99thPercentile'  # (2)
java.lang.Memory ObjectPendingFinalizationCount                     # (3)

would evaluate to resp.:

350                                                                 # (1)
541                                                                 # (2)
761                                                                 # (3)

The expressions

com.groupon.requesthandlers.ApiClientsListHandler Verbose           # (4)
not.a.group                                       Verbose           # (5)

would evaluate to an empty value. Expression 4 would be empty, because the group com.groupon.requesthandlers.ApiClientsListHandler doesn't have a metric Verbose. Expression 5 would be empty, because the group not.a.group doesn't exist.