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4.7.2. Point Tracing

Point tracing allows the application programmer to export metrics related to salient events. The pmtracepoint function is most useful when start and end points are not well defined. For example, this function is useful when the code branches in such a way that a transaction cannot be clearly identified, or when processing does not follow a transactional model, or when the desired instrumentation is akin to event rates rather than event service times. This data is exported through the trace.point metrics listed in Table 4.3, “trace.point Metrics”:

Table 4.3. trace.point Metrics

Metric
Description
trace.point.count
Running count of point observations for each tag seen since the trace PMDA started.
trace.point.rate
The average rate at which observation points occur for each tag within the last sample duration.