What is Activity Stream?

Activity Stream is the Firefox module which manages the in product content pages for Firefox:

The Activity Stream team has implemented data collection in and around these pages. This data has some overlap with the standard Firefox Telemetry system, however it is a custom system, designed and maintained by that team.

For specific questions about this data, reach out to the #fx-messaging-system Slack channel directly.

Activity Stream Pings

This data is measured in various custom pings that are sent via PingCentre (different from Pingsender).

Accessing Activity Stream Data

The various Activity Stream pings are stored in tables stored in the Tiles Redshift database, maintained by the Activity Stream team.

This database can be accessed via re:dash, or in Databricks via a workaround provided by the Data Operations team, tracked in this bug.

Gotchas and Caveats

Since this data collection isn't collected or maintained through our standard Telemetry API, there are a number of "gotchas" to keep in mind when working on this data.

  • Ping send conditions: Activity Stream pings have different send conditions, both from Telemetry pings as well as from each other. AS Health Pings, for example, get sent by all profiles with Telemetry enabled, upon startup of each Firefox session. In contrast, AS Session Pings only get sent by profiles that entered an Activity Stream session, at the end of that session, regardless of how long that session is. Compare this to main pings, which get sent by all Telemetry enabled profiles upon subsession end (browser shutdown, environment change, or local midnight cutoff).

    Due to these inconsistencies, using data from different sources can be tricky. For example, if we wanted to know how much of DAU (from main pings) had a custom about:home page (available in AS Health Pings), joining on client_id and a date field would only provide information on profiles that started the session on that same day (active profiles on multi-day sessions would be excluded).

  • Population covered: In addition to the usual considerations when looking at a measurement (in what version of Firefox did this measurement start getting collected? In what channels is it enabled in? etc.), when working with this data, there are additional Activity Stream specific conditions to consider when deciding "who is eligible to send this ping?"

    For example, Pocket recommendations are only enabled in the US, CA, and DE countries, for profiles that are on en-US, en-CA, and DE locales. Furthermore, users can set their about:home and about:newtab page to non-Activity Stream pages. This information can be important when deciding denominators for certain metrics.

  • Different ping types in the same table: The tables in the Tiles database can contain multiple types of pings. For example, the assa_events_daily table contains both AS Page Takeover pings as well as AS User Event pings.

  • Inconsistent fields: In some tables, the same field can have different meanings for different records.

    For example, in the assa_router_events_daily table, the impression_id field corresponds to the standard Telemetry client_id field for Snippets impressions, CFR impressions for pre-release and shield experiments, and onboarding impressions. However, for CFR impressions for release, this field is a separate, impression identifier.

  • Passing Experiment Tags: If a profile is enrolled in a Normandy experiment, the experiment slug for that profile is only passed to the Activity Stream data if it contains the string "activity-stream".

    In other words, Activity Stream will not tag data as belonging to an experiment if it is missing "activity-stream" in the slug, even if it is indeed enrolled in an experiment.

  • Data field formats: The format for some of the data that is shared with standard Telemetry can differ.

    For example, experiment slugs in standard Telemetry is formatted as an array of maps (one for each experiment the profile is enrolled in)

    [{'experiment1_name':'branch_name'}, {'experiment2_name':'branch_name'}]

    However, in the Activity Stream telemetry, experiment slugs are reported in a string, using ; as a separater between experiments and : as a separator between experiment name and branch name.


  • Null handling: Some fields in the Activity Stream data encode nulls with a 'N/A' string or a -1 value.

  • Changes in ping behaviors: These pings continue to undergo development and the behavior as well as possible values for a given ping seem to change over time. For example, older versions of the event pings for clicking on a Topsite do not seem to report card_types and icon_types, while newer versions do. Caution is advised.

  • Pocket data: Data related to Pocket interaction and usage in the about:home and about:newtab pages get sent to Pocket via this data collection and pipeline. However, due to privacy reasons, that data is sanitized and client_id is randomized. So while it is possible to ask, "how many Topsites and Highlights did a given profile click on in a given day?", we cannot answer that question for Pocket tiles.


Sessions per client_id

Note: only includes client_ids that completed an Activity Stream session that day.

	count(DISTINCT session_id) as num_sessions
	date = '20190601' 

Topsite clicks and Highlights clicks

	source in ('TOP_SITES', 'HIGHLIGHTS')
	AND event = 'CLICK'
	AND date = '20190601' 

Snippet impressions, blocks, clicks, and dismissals

Note: Which snippet message a record corresponds to can be identified by the message_id (check with Marketing for snippet recipes published).

    impression_id AS client_id, 
	source = 'snippets_user_event'
  	AND date = '20190601'