Added performance benchmarking doc

CHANGELOG.md

@@ -21,6 +21,8 @@ For experimental package changes, see the [experimental CHANGELOG](experimental/
 
 ### :books: (Refine Doc)
 
+* docs(contributing): added guidelines for adding benchmark tests [#4169](https://github.com/open-telemetry/opentelemetry-js/pull/4169)
+
 ### :house: (Internal)
 
 * test: added a performance benchmark test for span creation [#4105](https://github.com/open-telemetry/opentelemetry-js/pull/4105)

doc/contributing/benchmark-tests.md

@@ -0,0 +1,53 @@
+
+# Performance Benchmark Testing Guide
+
+Benchmark tests are intended to measure performance of small units of code.
+
+It is recommended that operations that have a high impact on the performance of the SDK (or potential for) are accompanied by a benchmark test. This helps end-users understand the performance trend over time, and it also helps maintainers catch performance regressions.
+
+Benchmark tests are run automatically with every merge to main, and the results are available at <https://open-telemetry.github.io/opentelemetry-js/benchmark>.
+
+## Running benchmark tests
+
+Performance benchmark tests can be run from the root for all modules or from a single module directory only for that module:
+
+``` bash
+# benchmark all modules
+npm run test:bench
+
+# benchmark a single module
+cd packages/opentelemetry-sdk-trace-base
+npm run test:bench
+```
+
+## Adding a benchmark test
+
+Unlike unit tests, benchmark tests should be written in plain JavaScript (not Typescript).
+
+Add a new test file in folder `test/performance/benchmark` using the following as a template:
+
+``` javascript
+const Benchmark = require('benchmark');
+
+const suite = new Benchmark.Suite();
+
+suite.on('cycle', event => {
+  console.log(String(event.target));
+});
+
+suite.add('new benchmark test', function() {
+ // write code to test ...
+});
+
+suite.run();
+```
+
+## Automatically running benchmark tests
+
+If you want your test to run automatically with every merge to main (to track trend over time), register the new test file by requiring it in `test/performance/benchmark/index.js`.
+
+Add the `test:bench` script in package.json, if the module does not contain it already.
+
+``` json
+"test:bench": "node test/performance/benchmark/index.js | tee .benchmark-results.txt"
+```

doc/metrics.md

@@ -286,7 +286,7 @@ await myTask()
 
 ## Describing a instrument measurement
 
-Using attributes, kind, and the related [semantic conventions](https://github.com/open-telemetry/opentelemetry-specification/tree/main/specification/metrics/semantic_conventions), we can more accurately describe the measurement in a way our metrics backend will more easily understand. The following example uses these mechanisms, which are described below, for recording a measurement
+Using attributes, kind, and the related [semantic conventions](https://github.com/open-telemetry/semantic-conventions/blob/main/docs/general/metrics.md), we can more accurately describe the measurement in a way our metrics backend will more easily understand. The following example uses these mechanisms, which are described below, for recording a measurement
 of a HTTP request.
 
 Each metric instruments allows to associate a description, unit of measure, and the value type.
@@ -343,7 +343,7 @@ One problem with metrics names and attributes is recognizing, categorizing, and
 
 The use of semantic conventions is always recommended where applicable, but they are merely conventions. For example, you may find that some name other than the name suggested by the semantic conventions more accurately describes your metric, you may decide not to include a metric attribute which is suggested by semantic conventions for privacy reasons, or you may wish to add a custom attribute which isn't covered by semantic conventions. All of these cases are fine, but please keep in mind that if you stray from the semantic conventions, the categorization of metrics in your metrics backend may be affected.
 
-_See the current metrics semantic conventions in the OpenTelemetry Specification repository: <https://github.com/open-telemetry/opentelemetry-specification/tree/main/specification/metrics/semantic_conventions>_
+_See the current metrics semantic conventions in the OpenTelemetry Specification repository: <https://github.com/open-telemetry/semantic-conventions/blob/main/docs/general/metrics.md>_
 
 [spec-overview]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/overview.md
 

doc/tracing.md

@@ -76,7 +76,7 @@ server.on("GET", "/user/:id", onGet);
 
 ## Describing a Span
 
-Using span relationships, attributes, kind, and the related [semantic conventions](https://github.com/open-telemetry/opentelemetry-specification/tree/main/specification/trace/semantic_conventions), we can more accurately describe the span in a way our tracing backend will more easily understand. The following example uses these mechanisms, which are described below.
+Using span relationships, attributes, kind, and the related [semantic conventions](https://github.com/open-telemetry/semantic-conventions/blob/main/docs/general/trace.md), we can more accurately describe the span in a way our tracing backend will more easily understand. The following example uses these mechanisms, which are described below.
 
 ```typescript
 import { NetTransportValues, SemanticAttributes } from '@opentelemetry/semantic-conventions';
@@ -209,6 +209,6 @@ Consumer spans represent the processing of a job created by a producer and may s
 
 One problem with span names and attributes is recognizing, categorizing, and analyzing them in your tracing backend. Between different applications, libraries, and tracing backends there might be different names and expected values for various attributes. For example, your application may use `http.status` to describe the HTTP status code, but a library you use may use `http.status_code`. In order to solve this problem, OpenTelemetry uses a library of semantic conventions which describe the name and attributes which should be used for specific types of spans. The use of semantic conventions is always recommended where applicable, but they are merely conventions. For example, you may find that some name other than the name suggested by the semantic conventions more accurately describes your span, you may decide not to include a span attribute which is suggested by semantic conventions for privacy reasons, or you may wish to add a custom attribute which isn't covered by semantic conventions. All of these cases are fine, but please keep in mind that if you stray from the semantic conventions, the categorization of spans in your tracing backend may be affected.
 
-_See the current trace semantic conventions in the OpenTelemetry Specification repository: <https://github.com/open-telemetry/opentelemetry-specification/tree/main/specification/trace/semantic_conventions>_
+_See the current trace semantic conventions in the OpenTelemetry Specification repository: <https://github.com/open-telemetry/semantic-conventions/blob/main/docs/general/trace.md>_
 
 [spec-overview]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/overview.md