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564bbdef83
This change enforces URL-like metric names to match the behavior of Stackdriver. The StackdriverWriter no longer prepends a slash, which was a crutch. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=130537347
72 lines
2.6 KiB
Java
72 lines
2.6 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 static com.google.common.base.Preconditions.checkArgument;
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import com.google.auto.value.AutoValue;
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import com.google.common.collect.ImmutableSet;
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/** The description of a metric's schema. */
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@AutoValue
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public abstract class MetricSchema {
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MetricSchema() {}
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/**
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* Returns an instance of {@link MetricSchema}.
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*
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* @param name must have a URL-like hierarchical name, for example "/cpu/utilization".
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* @param description a human readable description of the metric. Must not be blank.
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* @param valueDisplayName a human readable description of the metric's value. Must not be blank.
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* @param kind the kind of metric.
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* @param labels an ordered set of mandatory metric labels. For example, a metric may track error
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* code as a label. If labels are set, corresponding label values must be provided when values
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* are set. The set of labels may be empty.
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*/
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static MetricSchema create(
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String name,
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String description,
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String valueDisplayName,
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Kind kind,
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ImmutableSet<LabelDescriptor> labels) {
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checkArgument(!name.isEmpty(), "Name must not be blank");
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checkArgument(!description.isEmpty(), "Description must not be blank");
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checkArgument(!valueDisplayName.isEmpty(), "Value Display Name must not be empty");
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checkArgument(name.startsWith("/"), "Name must be URL-like and start with a '/'");
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// TODO(b/30916431): strengthen metric name validation.
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return new AutoValue_MetricSchema(name, description, valueDisplayName, kind, labels);
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}
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public abstract String name();
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public abstract String description();
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public abstract String valueDisplayName();
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public abstract Kind kind();
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public abstract ImmutableSet<LabelDescriptor> labels();
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/**
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* The kind of metric. CUMULATIVE metrics have values relative to an initial value, and GAUGE
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* metrics have values which are standalone.
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*/
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public enum Kind {
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CUMULATIVE,
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GAUGE,
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}
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}
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