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91f8b6da38
This CL also adds IncrementableMetric#reset() methods to allow resetting the value and start timestamp of IncrementableMetrics. This is necessary because some backends, like Stackdriver, use non-monotonic changes in cumulative metric values to detect timeseries restarts. Tracking and re-setting the start timestamp allows users to track mostly monotonic metrics which may have non-monotonic discontinuities. See https://cloud.google.com/monitoring/api/ref_v3/rest/v3/TimeSeries#Point for more details. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=130795229
43 lines
1.4 KiB
Java
43 lines
1.4 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.monitoring.metrics;
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import com.google.common.collect.ImmutableList;
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/**
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* A Metric which stores timestamped values.
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*
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* <p>This is a read-only view.
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*/
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public interface Metric<V> {
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/**
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* Returns the latest {@link MetricPoint} instances for every label-value combination tracked for
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* this metric.
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*/
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ImmutableList<MetricPoint<V>> getTimestampedValues();
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/** Returns the count of values being stored with this metric. */
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int getCardinality();
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/** Returns the schema of this metric. */
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MetricSchema getMetricSchema();
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/**
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* Returns the type for the value of this metric, which would otherwise be erased at compile-time.
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* This is useful for implementors of {@link MetricWriter}.
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*/
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Class<V> getValueClass();
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}
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