@opentelemetry/instrumentation-memcached

OpenTelemetry Memcached Instrumentation for Node.js

This module provides automatic instrumentation for the memcached@>=2.2.0 module, which may be loaded using the @opentelemetry/sdk-trace-node package and is included in the @opentelemetry/auto-instrumentations-node bundle.

If total installation size is not constrained, it is recommended to use the @opentelemetry/auto-instrumentations-node bundle with @opentelemetry/sdk-node for the most seamless instrumentation experience.

Compatible with OpenTelemetry JS API and SDK 1.0+.

Installation

npm install --save @opentelemetry/instrumentation-memcached

Supported Versions

• memcached versions >=2.2.0 <3

Usage

OpenTelemetry Memcached Instrumentation allows the user to automatically collect trace data and export them to the backend of choice, to give observability to distributed systems when working with memcached.

To load a specific instrumentation (memcached in this case), specify it in the registerInstrumentations' configuration

const { NodeTracerProvider } = require('@opentelemetry/sdk-trace-node');
const { MemcachedInstrumentation } = require('@opentelemetry/instrumentation-memcached');
const { registerInstrumentations } = require('@opentelemetry/instrumentation');

const provider = new NodeTracerProvider();
provider.register();

registerInstrumentations({
  instrumentations: [
    new MemcachedInstrumentation({
      enhancedDatabaseReporting: false,
    }),
  ],
});

Configuration Options

Option	Type	Example	Description
enhancedDatabaseReporting	boolean	false	Include full command statement in the span - leaks potentially sensitive information to your spans. Defaults to false.

Semantic Conventions

This instrumentation implements Semantic Conventions (semconv) v1.7.0. Since then, networking (in semconv v1.23.1) and database (in semconv v1.33.0) semantic conventions were stabilized. As of @opentelemetry/instrumentation-memcached@0.51.0 support has been added for migrating to the stable semantic conventions using the OTEL_SEMCONV_STABILITY_OPT_IN environment variable as follows:

• Upgrade to the latest version of this instrumentation package.
• Set OTEL_SEMCONV_STABILITY_OPT_IN=http/dup,database/dup to emit both old and stable semantic conventions. (The http token is used to control the net.* attributes, the database token to control to db.* attributes.)
• Modify alerts, dashboards, metrics, and other processes in your Observability system to use the stable semantic conventions.
• Set OTEL_SEMCONV_STABILITY_OPT_IN=http,database to emit only the stable semantic conventions.

By default, if OTEL_SEMCONV_STABILITY_OPT_IN includes neither of the above tokens, the old v1.7.0 semconv is used. The intent is to provide an approximate 6 month time window for users of this instrumentation to migrate to the new database and networking semconv, after which a new minor version will use the new semconv by default and drop support for the old semconv. See the HTTP migration guide and the database migration guide for details.

Attributes collected:

Old semconv	Stable semconv	Description
db.system	db.system.name	'memcached'
db.operation	db.operation.name	The name of the operation being executed.
db.statement	db.query.text	The database statement being executed (only if enhancedDatabaseReporting is enabled).
net.peer.name	server.address	Remote hostname or similar.
net.peer.port	server.port	Remote port number.

Useful links

• For more information on OpenTelemetry, visit: https://opentelemetry.io/
• For more about OpenTelemetry JavaScript: https://github.com/open-telemetry/opentelemetry-js
• For help or feedback on this project, join us in GitHub Discussions

License

Apache 2.0 - See LICENSE for more information.

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