Monitoring Metrics - Timer
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About
A Timer is a metrics type that send two value (two time series):
- the count of timed events (to measure throughput)
- and the total time of all events (to measure latency ie Total time / count).
As a timer reports the total time, a timer may not send any record until the task is complete. For long running task such as a background process, a long duration timer that sends the actual duration may be used.
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Example
Suppose we configure publishing at 10 second intervals and we saw 20 requests that each took 100ms. Then for the first interval:
- count = 10 seconds * (20 requests / 10 seconds) = 20 requests
- totalTime = 10 seconds * (20 * 100 ms / 10 seconds) = 2 seconds
- Rate: totalTime/count = 10 requests / second