Package io.opentelemetry.api.metrics
Interface DoubleValueObserver
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- All Superinterfaces:
AsynchronousInstrument
,Instrument
@ThreadSafe public interface DoubleValueObserver 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 DoubleValueObserver cpuObserver = // meter. // .doubleValueObserverBuilder("cpu_temperature") // .setDescription("System CPU temperature") // .setUnit("ms") // .build(); // // void init() { // cpuObserver.setUpdater( // new DoubleValueObserver.Callback<DoubleResult>() { // @Override // public void update(DoubleResult result) { // // Get system cpu temperature // result.observe(cpuTemperature); // } // }); // } // }
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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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