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Readme

OpenTelemetry redis Instrumentation for Node.js

This module provides automatic instrumentation for the redis module versions >=2.6.0 <6, 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-redis

Supported Versions

redis versions >=2.6.0 <6

Usage

OpenTelemetry Redis 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 redis.

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

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

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

registerInstrumentations({
  instrumentations: [
    new RedisInstrumentation(),
  ],
})

See examples/redis for a short example.

Redis Instrumentation Options

Redis instrumentation has a few options available to choose from. You can set the following:

Options	Type	Description
`dbStatementSerializer`	`DbStatementSerializer` (function)	Redis instrumentation will serialize the command to the `db.statement` attribute using the specified function.
`responseHook`	`RedisResponseCustomAttributeFunction` (function)	Function for adding custom attributes on db response. Receives params: `span, moduleVersion, cmdName, cmdArgs`
`requireParentSpan`	`boolean`	Require parent to create redis span, default when unset is false.

Custom `db.statement` Serializer

The instrumentation serializes the command into a Span attribute called db.statement. The standard serialization format attempts to be as informative as possible while avoiding the export of potentially sensitive data. The number of serialized arguments depends on the specific command, see the configuration list in @opentelemetry/redis-common.

It is also possible to define a custom serialization function. The function will receive the command name and arguments and must return a string.

Here is a simple example to serialize the command name and all command arguments. Notice that it might capture sensitive data and big payloads:

const { RedisInstrumentation } = require('@opentelemetry/instrumentation-redis');

const redisInstrumentation = new RedisInstrumentation({
  dbStatementSerializer: function (cmdName, cmdArgs) {
    return [cmdName, ...cmdArgs].join(" ");
  },
});

Semantic Conventions

This package uses @opentelemetry/semantic-conventions version 1.22+, which implements Semantic Convention Version 1.7.0 ("old" conventions).

It also supports the new stable semantic conventions introduced in [Version 1.33.0] By default, old semantic conventions are used. Use the OTEL_SEMCONV_STABILITY_OPT_IN environment variable to control which version to emit.

Attributes collected:

Old Semantic Conventions (default)

Attribute	Short Description
`db.connection_string`	URL to Redis server address, of the form `redis://host:port`
`db.statement`	Executed Redis statement
`db.system`	Database identifier; always `redis`
`net.peer.name`	Hostname or IP of the connected Redis server
`net.peer.port`	Port of the connected Redis server

Stable Semantic Conventions (v1.33.0)

Attribute	Short Description
`db.operation.name`	Redis command name
`db.operation.batch.size`	Number of commands in a Redis `MULTI/EXEC` transaction
`db.query.text`	The database query being executed
`db.system.name`	Database identifier; always `redis`
`server.address`	Hostname or IP of the connected Redis server
`server.port`	Port of the connected Redis server

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.

@opentelemetry/instrumentation-redis