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+/*
+ * Copyright 2018, OpenCensus Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * This package describes the Metrics data model. Metrics are a data model for what stats exporters
+ * take as input. This data model may eventually become the wire format for metrics.
+ *
+ * <p>WARNING: Currently all the public classes under this package are marked as {@link
+ * io.opencensus.common.ExperimentalApi}. The classes and APIs under {@link io.opencensus.metrics}
+ * are likely to get backwards-incompatible updates in the future. DO NOT USE except for
+ * experimental purposes.
+ *
+ * <p>Please see
+ * https://github.com/census-instrumentation/opencensus-specs/blob/master/stats/Metrics.md and
+ * https://github.com/census-instrumentation/opencensus-proto/blob/master/opencensus/proto/stats/metrics/metrics.proto
+ * for more details.
+ */
+@io.opencensus.common.ExperimentalApi
+package io.opencensus.metrics;