Package io.opentelemetry.api.metrics
Interface DoubleUpDownCounter
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- All Superinterfaces:
Instrument
,SynchronousInstrument<BoundDoubleUpDownCounter>
@ThreadSafe public interface DoubleUpDownCounter extends SynchronousInstrument<BoundDoubleUpDownCounter>
UpDownCounter is a synchronous instrument and very similar to Counter except that Add(increment) supports negative increments. This makes UpDownCounter not useful for computing a rate aggregation. The default aggregation is `Sum`, only the sum is non-monotonic. It is generally useful for capturing changes in an amount of resources used, or any quantity that rises and falls during a request.Example:
class YourClass { private static final Meter meter = OpenTelemetry.getMeterProvider().get("my_library_name"); private static final DoubleUpDownCounter upDownCounter = meter. .doubleUpDownCounterBuilder("resource_usage") .setDescription("Current resource usage") .setUnit("1") .build(); // It is recommended that the API user keep references to a Bound Counters. private static final BoundDoubleUpDownCounter someWorkBound = upDownCounter.bind("work_name", "some_work"); void doSomeWork() { someWorkBound.add(10.2); // Resources needed for this task. // Your code here. someWorkBound.add(-10.0); } }
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description void
add(double increment)
Adds the givenincrement
to the current value.void
add(double increment, Labels labels)
Adds the givenincrement
to the current value.BoundDoubleUpDownCounter
bind(Labels labels)
Returns aBound Instrument
associated with the specified labels.
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Method Detail
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add
void add(double increment, Labels labels)
Adds the givenincrement
to the current value.The value added is associated with the current
Context
and provided set of labels.- Parameters:
increment
- the value to add.labels
- the labels to be associated to this recording.
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add
void add(double increment)
Adds the givenincrement
to the current value.The value added is associated with the current
Context
and empty labels.- Parameters:
increment
- the value to add.
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bind
BoundDoubleUpDownCounter bind(Labels labels)
Description copied from interface:SynchronousInstrument
Returns aBound Instrument
associated with the specified labels. Multiples requests with the same set of labels may return the sameBound Instrument
instance.It is recommended that callers keep a reference to the Bound Instrument instead of always calling this method for every operation.
- Specified by:
bind
in interfaceSynchronousInstrument<BoundDoubleUpDownCounter>
- Parameters:
labels
- the set of labels, as key-value pairs.- Returns:
- a
Bound Instrument
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