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    3.2.0-5 • Public • Published

    Sumo Logic OpenTelemetry RUM

    The Sumo Logic OpenTelemetry auto-instrumentation for JavaScript library enables tracing in the browser.


    • XMLHttpRequest and Fetch APIs auto-instrumentation
    • user interactions like click, submit, drop etc.
    • document load with fetched resources
    • History API and hash change support
    • web-vitals
    • session id
    • longtasks with automatic context attaching
    • uncaught exceptions, unhandled rejections, document errors and console errors
    • support for manual instrumentation
    • automatic context carrying through timers, promises, native async-await, events, observers and more
    • 98 KB (29 KB gzipped)


    The easiest way to start collecting traces from your website is to put the code below inside the <head></head> tags on your website:

      window.sumoLogicOpenTelemetryRum &&
          collectionSourceUrl: 'sumo_logic_traces_collector_source_url',
          serviceName: 'name_of_your_web_service',
          propagateTraceHeaderCorsUrls: [

    See configuration for all supported options.

    There are no other required actions needed to take. With properly provided collectionSourceUrl and serviceName your website is ready and will send collected traces to the specified Sumo Logic collector.

    You can load the script asynchronously using the script below, but some functionalities like user interactions or requests made before script run will be limited.

      (function (w, s, d, r, e, n) {
        (w[s] = w[s] || {
          readyListeners: [],
          onReady: function (e) {
          ((e = d.createElement('script')).async = 1),
          (e.src = r),
          (n = d.getElementsByTagName('script')[0]).parentNode.insertBefore(e, n);
      window.sumoLogicOpenTelemetryRum.onReady(function () {
          collectionSourceUrl: 'sumo_logic_traces_collector_source_url',
          serviceName: 'name_of_your_web_service',
          propagateTraceHeaderCorsUrls: [

    Manual installation

    The other option is to bundle this library inside your project and initialize it.

    Inside your project directory execute npm install @sumologic/opentelemetry-rum.

    RUM needs to be initialized preferably before other functionalities in your code:

    import { initialize } from '@sumologic/opentelemetry-rum';
      collectionSourceUrl: 'sumo_logic_traces_collector_source_url',
      serviceName: 'name_of_your_web_service',
      propagateTraceHeaderCorsUrls: ['list_of_domains_to_receive_trace_context'],


    Both script tag and manual installation can be configured with following parameters:

    Parameter Type Default Description
    collectionSourceUrl string required Sumo Logic collector source url
    authorizationToken string Sumo Logic collector authorization token
    serviceName string "unknown" Name of your web service
    applicationName string Name of your application
    deploymentEnvironment string The software deployment (e.g. staging, production)
    defaultAttributes object {} Attributes added to each span
    samplingProbability number 1 1 means all traces are sent, 0 - no traces are send, 0.5 - there is 50% change for a trace to be sent
    bufferMaxSpans number 2048 Maximum number of spans waiting to be send
    maxExportBatchSize number 50 Maximum number of spans in one request
    bufferTimeout number 2000ms Time in milliseconds for spans waiting to be send
    ignoreUrls (string|RegExp)[] [] List of XHR URLs to ignore (e.g. analytics)
    propagateTraceHeaderCorsUrls (string|RegExp)[] [] List of URLs where W3C Trace Context HTTP header will be injected
    collectSessionId boolean true Enables collecting rum.session_id attribute
    dropSingleUserInteractionTraces boolean true Automatically drops traces with only one span coming from the user-interaction instrumentation (click etc.)
    collectErrors boolean true Automatically collect and send uncaught exceptions, unhandled rejections, document errors and console errors

    Trace context propagation

    By default, trace context propagation, allowing creation of end to and front end to backend traces for cross-origin requests is not enabled because of browser CORS security restrictions. To propagate tracing context to create front-end to back-end traces, set exact URLs or URL patterns in the propagateTraceHeaderCorsUrls configuration option. You must configure your server to return accept and return following CORS headers in its response: Access-Control-Allow-Headers: traceparent, tracestate. Read W3C Trace Context for more details. Sumo Logic cannot perform any validation correct configuration of services of other origins, so, please be careful when configuring this. You should always try enabling CORS in a test environment before setting it up in production.

    For example:

    // propagates trace context in requests made to https://api.sumologic.com or http://localhost:3000/api URLs
    propagateTraceHeaderCorsUrls: [

    Manual instrumentation

    When initialized by the <script /> tag, window attribute sumoLogicOpenTelemetryRum is exposed. It gives possibility to create spans manually. Global sumoLogicOpenTelemetryRum objects contains:


    const { tracer, api, recordError } = sumoLogicOpenTelemetryRum;
    const span = tracer.startSpan('fetchUserData', {
      attributes: { organization: 'client-a' },
    api.context.with(api.trace.setSpan(api.context.active(), span), () => {
      // long running operation
    recordError('Cannot load data', { organization: 'test' });

    Using in production, make sure your website works when sumoLogicOpenTelemetryRum is not defined (e.g. blocked by a browser extension).

    Disable instrumentation

    Instrumentation can be disabled and enabled again in runtime using registerInstrumentations() and disableInstrumentations() methods.

    // some code with instrumentations disabled

    Public API

    All method are available under the window.sumoLogicOpenTelemetryRum object.

    setDefaultAttribute(key, value)

    Extends the list of default attributes specified during initialization.

    Example: window.sumoLogicOpenTelemetryRum.setDefaultAttribute('user_id', userId)


    Returns current value of the rum.session_id attribute. Returned value may change in time, so don't cache it.

    Example: window.sumoLogicOpenTelemetryRum.getCurrentSessionId()


    Sends an error with the given message and optional attributes.

    Example: window.sumoLogicOpenTelemetryRum.recordError('Cannot load data', { organization: 'test' })


    This project is released under the Apache 2.0 License.


    Please refer to our Contributing documentation to get started.

    Code Of Conduct

    Please refer to our Code of Conduct.


    npm i @sumologic/opentelemetry-rum

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