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+// Copyright The OpenTelemetry 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.
+
+// Package metric provides support for reporting measurements using instruments.
+//
+// Instruments are categorized as below:
+//
+// Synchronous instruments are called by the user with a Context.
+// Asynchronous instruments are called by the SDK during collection.
+//
+// Additive instruments are semantically intended for capturing a sum.
+// Non-additive instruments are intended for capturing a distribution.
+//
+// Additive instruments may be monotonic, in which case they are
+// non-descreasing and naturally define a rate.
+//
+// The synchronous instrument names are:
+//
+//   Counter:           additive, monotonic
+//   UpDownCounter:     additive
+//   ValueRecorder:     non-additive
+//
+// and the asynchronous instruments are:
+//
+//   SumObserver:       additive, monotonic
+//   UpDownSumObserver: additive
+//   ValueObserver:     non-additive
+//
+// All instruments are provided with support for either float64 or
+// int64 input values.
+//
+// The Meter interface supports allocating new instruments as well as
+// interfaces for recording batches of synchronous measurements or
+// asynchronous observations.  To obtain a Meter, use a MeterProvider.
+//
+// The MeterProvider interface supports obtaining a named Meter interface. To
+// obtain a MeterProvider implementation, initialize and configure any
+// compatible SDK.
+package metric // import "go.opentelemetry.io/otel/api/metric"