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Quick start for Internal Event Tracking

In an effort to provide a more efficient, scalable, and unified tracking API, GitLab is deprecating existing RedisHLL and Snowplow tracking. Instead, we're implementing a new track_event (Backend) and trackEvent(Frontend) method. With this approach, we can update both RedisHLL counters and send Snowplow events without worrying about the underlying implementation.

In order to instrument your code with Internal Events Tracking you need to do three things:

  1. Define an event
  2. Define one or more metrics
  3. Trigger the event

Defining event and metrics

To create event and/or metric definitions, use the internal_events generator from the gitlab directory:

scripts/internal_events/cli.rb

This CLI will help you create the correct defintion files based on your specific use-case, then provide code examples for instrumentation and testing.

Events should be named in the format of <action>_<target_of_action>_<where/when>, valid examples are create_ci_build or click_previous_blame_on_blob_page.

Trigger events

Triggering an event and thereby updating a metric is slightly different on backend and frontend. Refer to the relevant section below.

Backend tracking

To trigger an event, call the track_internal_event method from the Gitlab::InternalEventsTracking module with the desired arguments:

include Gitlab::InternalEventsTracking

track_internal_event(
  "create_ci_build",
  user: user,
  namespace: namespace,
  project: project
)

This method automatically increments all RedisHLL metrics relating to the event create_ci_build, and sends a corresponding Snowplow event with all named arguments and standard context (SaaS only). In addition, the name of the class triggering the event is saved in the category property of the Snowplow event.

If you have defined a metric with a unique property such as unique: project.id it is required that you provide the project argument.

It is encouraged to fill out as many of user, namespace and project as possible as it increases the data quality and make it easier to define metrics in the future.

If a project but no namespace is provided, the project.namespace is used as the namespace for the event.

In some cases you might want to specify the category manually or provide none at all. To do that, you can call the InternalEvents.track_event method directly instead of using the module.

In case when a feature is enabled through multiple namespaces and its required to track why the feature is enabled, it is possible to pass an optional feature_enabled_by_namespace_ids parameter with an array of namespace ids.

track_internal_event(
  ...
  feature_enabled_by_namespace_ids: [namespace_one.id, namespace_two.id]
)

Additional properties

Additional properties can be passed when tracking events. They can be used to save additional data related to given event.

Tracking classes have built-in properties with keys label (string), property (string) and value(numeric). It's recommended to use these properties first.

Additional properties are passed by including the additional_properties hash in the #track_event call:

track_internal_event(
  "create_ci_build",
  user: user,
  additional_properties: {
    label: 'scheduled',
    value: 20
  }
)

If you need to pass more than three additional properties, you can use the additional_properties hash with your custom keys:

track_internal_event(
  "code_suggestion_accepted",
  user: user,
  additional_properties: {
    label: 'vsc',
    property: 'automatic',
    value: 200,
    lang: 'ruby',
    custom_key: 'custom_value'
  }
)

Please add custom properties only in addition to the built-in properties.

Custom rules can not be used as metric filters.

Controller and API helpers

There is a helper module ProductAnalyticsTracking for controllers you can use to track internal events for particular controller actions by calling #track_internal_event:

class Projects::PipelinesController < Projects::ApplicationController
  include ProductAnalyticsTracking

  track_internal_event :charts, name: 'visit_charts_on_ci_cd_pipelines', conditions: -> { should_track_ci_cd_pipelines? }

  def charts
    ...
  end

  private

  def should_track_ci_cd_pipelines?
    params[:chart].blank? || params[:chart] == 'pipelines'
  end
end

You need to add these two methods to the controller body, so that the helper can get the current project and namespace for the event:

  private

  def tracking_namespace_source
    project.namespace
  end

  def tracking_project_source
    project
  end

Also, there is an API helper:

track_event(
  event_name,
  user: current_user,
  namespace_id: namespace_id,
  project_id: project_id
)

Backend testing

When testing code that simply triggers an internal event and make sure it increments all the related metrics, you can use the internal_event_tracking shared example.

it_behaves_like 'internal event tracking' do
  let(:event) { 'create_new_issue' }
  let(:project) { issue.project }
  let(:user) { issue.author }
  let(:namespace) { group }
  subject(:service_action) { described_class.new(issue).save }
end

It requires a context containing:

  • subject - the action that triggers the event
  • event - the name of the event

Optionally, the context can contain:

  • user
  • project
  • namespace. If not provided, project.namespace will be used (if project is available).
  • category
  • label
  • property
  • value
  • event_attribute_overrides - is used when its necessary to override the attributes available in parent context. For example:
let(:event) { 'create_new_issue' }

it_behaves_like 'internal event tracking' do
  let(:event_attribute_overrides) { { event: 'create_new_milestone'} }

  subject(:service_action) { described_class.new(issue).save }
end

Composable matchers

When a singe action triggers an event multiple times, triggers multiple different events, or increments some metrics but not others for the event, you can use the trigger_internal_events and increment_usage_metrics matchers.

 expect { subject }
  .to trigger_internal_events('web_ide_viewed')
  .with(user: user, project: project, namespace: namespace)
  .and increment_usage_metrics('counts.web_views')

The trigger_internal_events matcher accepts the same chain methods as the receive matcher (#once, #at_most, etc). By default, it expects the provided events to be triggered only once.

The chain method #with accepts following parameters:

  • user - User object
  • project - Project object
  • namespace - Namespace object. If not provided, it will be set to project.namespace
  • additional_properties - Hash. Additional properties to be sent with the event. For example: { label: 'scheduled', value: 20 }
  • category - String. If not provided, it will be set to the class name of the object that triggers the event

The increment_usage_metrics matcher accepts the same chain methods as the change matcher (#by, #from, #to, etc). By default, it expects the provided metrics to be incremented by one.

expect { subject }
  .to trigger_internal_events('web_ide_viewed')
  .with(user: user, project: project, namespace: namespace)
  .exactly(3).times

Both matchers are composable with other matchers that act on a block (like change matcher).

expect { subject }
  .to trigger_internal_events('mr_created')
    .with(user: user, project: project, category: category, additional_properties: { label: label } )
  .and increment_usage_metrics('counts.deployments')
    .at_least(:once)
  .and change { mr.notes.count }.by(1)

To test that an event was not triggered, you can use the not_trigger_internal_events matcher. It does not accept message chains.

expect { subject }.to trigger_internal_events('mr_created')
    .with(user: user, project: project, namespace: namespace)
  .and increment_usage_metrics('counts.deployments')
  .and not_trigger_internal_events('pipeline_started')

Or you can use the not_to syntax:

expect { subject }.not_to trigger_internal_events('mr_created', 'member_role_created')

Frontend tracking

Any frontend tracking call automatically passes the values user.id, namespace.id, and project.id from the current context of the page.

If you need to pass any further properties, such as extra, context, label, property, and value, you can use the deprecated snowplow implementation. In this case, let us know about your specific use-case in our feedback issue for Internal Events.

Vue components

In Vue components, tracking can be done with Vue mixin.

To implement Vue component tracking:

  1. Import the InternalEvents library and call the mixin method:

    import { InternalEvents } from '~/tracking';
const trackingMixin = InternalEvents.mixin();

  2. Use the mixin in the component:

    export default {
  mixins: [trackingMixin],

  data() {
    return {
      expanded: false,
    };
  },
};

  3. Call the trackEvent method. Tracking options can be passed as the second parameter:

    this.trackEvent('click_previous_blame_on_blob_page');

    Or use the trackEvent method in the template:

    <template>
  <div>
    <button data-testid="toggle" @click="toggle">Toggle</button>

    <div v-if="expanded">
      <p>Hello world!</p>
      <button @click="trackEvent('click_previous_blame_on_blob_page')">Track another event</button>
    </div>
  </div>
</template>

Raw JavaScript

For tracking events directly from arbitrary frontend JavaScript code, a module for raw JavaScript is provided. This can be used outside of a component context where the Mixin cannot be utilized.

import { InternalEvents } from '~/tracking';
InternalEvents.trackEvent('click_previous_blame_on_blob_page');

Data-event attribute

This attribute ensures that if we want to track GitLab internal events for a button, we do not need to write JavaScript code on Click handler. Instead, we can just add a data-event-tracking attribute with event value and it should work. This can also be used with HAML views.

  <gl-button
    data-event-tracking="click_previous_blame_on_blob_page"
  >
   Click Me
  </gl-button>

Haml

= render Pajamas::ButtonComponent.new(button_options: { class: 'js-settings-toggle',  data: { event_tracking: 'click_previous_blame_on_blob_page' }}) do

Internal events on render

Sometimes we want to send internal events when the component is rendered or loaded. In these cases, we can add the data-event-tracking-load="true" attribute:

= render Pajamas::ButtonComponent.new(button_options: { data: { event_tracking_load: 'true', event_tracking: 'click_previous_blame_on_blob_page' } }) do
        = _("New project")

Additional properties

Additional properties can be passed when tracking events. They can be used to save additional data related to given event. It is possible to send a maximum of three additional properties with keys label (string), property (string) and value(numeric).

NOTE: Do not pass the page URL or page path as an additional property because we already track the pseudonymized page URL for each event. Getting the URL from window.location does not pseudonymize project and namespace information as documented.

For Vue Mixin:

   this.trackEvent('click_view_runners_button', {
    label: 'group_runner_form',
    property: dynamicPropertyVar,
    value: 20
   });

For raw JavaScript:

   InternalEvents.trackEvent('click_view_runners_button', {
    label: 'group_runner_form',
    property: dynamicPropertyVar,
    value: 20
   });

For data-event attributes:

  <gl-button
    data-event-tracking="click_view_runners_button"
    data-event-label="group_runner_form"
    :data-event-property=dynamicPropertyVar
  >
   Click Me
  </gl-button>

For Haml:

= render Pajamas::ButtonComponent.new(button_options: { class: 'js-settings-toggle',  data: { event_tracking: 'action', event_label: 'group_runner_form', event_property: dynamic_property_var, event_value: 2 }}) do

Frontend testing

If you are using the trackEvent method in any of your code, whether it is in raw JavaScript or a Vue component, you can use the useMockInternalEventsTracking helper method to assert if trackEvent is called.

For example, if we need to test the below Vue component,

<script>
import { GlButton } from '@gitlab/ui';
import { InternalEvents } from '~/tracking';
import { __ } from '~/locale';

export default {
  components: {
    GlButton,
  },
  mixins: [InternalEvents.mixin()],
  methods: {
    handleButtonClick() {
      // some application logic
      // when some event happens fire tracking call
      this.trackEvent('click_view_runners_button', {
        label: 'group_runner_form',
        property: 'property_value',
        value: 3,
      });
    },
  },
  i18n: {
    button1: __('Sample Button'),
  },
};
</script>
<template>
  <div style="display: flex; height: 90vh; align-items: center; justify-content: center">
    <gl-button class="sample-button" @click="handleButtonClick">
      {{ $options.i18n.button1 }}
    </gl-button>
  </div>
</template>

Below would be the test case for above component.

import { shallowMountExtended } from 'helpers/vue_test_utils_helper';
import DeleteApplication from '~/admin/applications/components/delete_application.vue';
import { useMockInternalEventsTracking } from 'helpers/tracking_internal_events_helper';

describe('DeleteApplication', () => {
  /** @type {import('helpers/vue_test_utils_helper').ExtendedWrapper} */
  let wrapper;

  const createComponent = () => {
    wrapper = shallowMountExtended(DeleteApplication);
  };

  beforeEach(() => {
    createComponent();
  });

  describe('sample button 1', () => {
    const { bindInternalEventDocument } = useMockInternalEventsTracking();
    it('should call trackEvent method when clicked on sample button', async () => {
      const { trackEventSpy } = bindInternalEventDocument(wrapper.element);

      await wrapper.find('.sample-button').vm.$emit('click');

      expect(trackEventSpy).toHaveBeenCalledWith(
        'click_view_runners_button',
        {
          label: 'group_runner_form',
          property: 'property_value',
          value: 3,
        },
        undefined,
      );
    });
  });
});

If you are using tracking attributes for in Vue/View templates like below,

<script>
import { GlButton } from '@gitlab/ui';
import { InternalEvents } from '~/tracking';
import { __ } from '~/locale';

export default {
  components: {
    GlButton,
  },
  mixins: [InternalEvents.mixin()],
  i18n: {
    button1: __('Sample Button'),
  },
};
</script>
<template>
  <div style="display: flex; height: 90vh; align-items: center; justify-content: center">
    <gl-button
      class="sample-button"
      data-event-tracking="click_view_runners_button"
      data-event-label="group_runner_form"
    >
      {{ $options.i18n.button1 }}
    </gl-button>
  </div>
</template>

Below would be the test case for above component.

import { shallowMountExtended } from 'helpers/vue_test_utils_helper';
import DeleteApplication from '~/admin/applications/components/delete_application.vue';
import { useMockInternalEventsTracking } from 'helpers/tracking_internal_events_helper';

describe('DeleteApplication', () => {
  /** @type {import('helpers/vue_test_utils_helper').ExtendedWrapper} */
  let wrapper;

  const createComponent = () => {
    wrapper = shallowMountExtended(DeleteApplication);
  };

  beforeEach(() => {
    createComponent();
  });

  describe('sample button', () => {
    const { bindInternalEventDocument } = useMockInternalEventsTracking();
    it('should call trackEvent method when clicked on sample button', () => {
      const { triggerEvent, trackEventSpy } = bindInternalEventDocument(wrapper.element);
      triggerEvent('.sample-button');
      expect(trackEventSpy).toHaveBeenCalledWith('click_view_runners_button', {
        label: 'group_runner_form',
      });
    });
  });
});