| Joey Armstrong | a6af152 | 2023-01-17 16:06:16 -0500 | [diff] [blame] | 1 | // Copyright The OpenTelemetry Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | // Package metric provides support for reporting measurements using instruments. |
| 16 | // |
| 17 | // Instruments are categorized as below: |
| 18 | // |
| 19 | // Synchronous instruments are called by the user with a Context. |
| 20 | // Asynchronous instruments are called by the SDK during collection. |
| 21 | // |
| 22 | // Additive instruments are semantically intended for capturing a sum. |
| 23 | // Non-additive instruments are intended for capturing a distribution. |
| 24 | // |
| 25 | // Additive instruments may be monotonic, in which case they are |
| 26 | // non-descreasing and naturally define a rate. |
| 27 | // |
| 28 | // The synchronous instrument names are: |
| 29 | // |
| 30 | // Counter: additive, monotonic |
| 31 | // UpDownCounter: additive |
| 32 | // ValueRecorder: non-additive |
| 33 | // |
| 34 | // and the asynchronous instruments are: |
| 35 | // |
| 36 | // SumObserver: additive, monotonic |
| 37 | // UpDownSumObserver: additive |
| 38 | // ValueObserver: non-additive |
| 39 | // |
| 40 | // All instruments are provided with support for either float64 or |
| 41 | // int64 input values. |
| 42 | // |
| 43 | // The Meter interface supports allocating new instruments as well as |
| 44 | // interfaces for recording batches of synchronous measurements or |
| 45 | // asynchronous observations. To obtain a Meter, use a MeterProvider. |
| 46 | // |
| 47 | // The MeterProvider interface supports obtaining a named Meter interface. To |
| 48 | // obtain a MeterProvider implementation, initialize and configure any |
| 49 | // compatible SDK. |
| 50 | package metric // import "go.opentelemetry.io/otel/api/metric" |