Package io.opentelemetry.api.metrics
Interface LongValueObserver
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- All Superinterfaces:
AsynchronousInstrument
,Instrument
@ThreadSafe public interface LongValueObserver extends AsynchronousInstrument
ValueObserver
is the asynchronous instrument corresponding to ValueRecorder, used to capture values that are treated as individual observations, recorded with the observe(value) method.A
ValueObserver
is a good choice in situations where a measurement is expensive to compute, such that it would be wasteful to compute on every request.Example:
// class YourClass { // // private static final Meter meter = OpenTelemetry.getMeterProvider().get("my_library_name"); // private static final LongValueObserver cpuObserver = // meter. // .longValueObserverBuilder("cpu_fan_speed") // .setDescription("System CPU fan speed") // .setUnit("ms") // .build(); // // void init() { // cpuObserver.setUpdater( // new LongValueObserver.Callback<LongResult>() { // @Override // public void update(LongResult result) { // // Get system cpu fan speed // result.observe(cpuFanSpeed); // } // }); // } // }
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Nested Class Summary
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Nested classes/interfaces inherited from interface io.opentelemetry.api.metrics.AsynchronousInstrument
AsynchronousInstrument.DoubleResult, AsynchronousInstrument.LongResult
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