Telemetry Channel Behavior

In every ping there are two channels:

  • App Update Channel
  • Normalized Channel

Expected Channels

The traditional channels we expect are:

App Update Channel

This is the channel reported by the application directly. This could really be anything, but is usually one of the expected release channels listed above.

For BigQuery tables corresponding to Telemetry Ping types, such as main, crash or event, the field here is called app_update_channel and is found in metadata.uri. For example:

SELECT
  metadata.uri.app_update_channel
FROM
  telemetry.main
WHERE
  DATE(submission_timestamp) = '2019-09-01'
LIMIT
  10

Normalized Channel

This field is a normalization of the directly reported channel, and replaces unusual and unexpected values with the string Other. There are a couple of exceptions, notably that variations on nightly-cck-* become nightly. See the relevant code here.

Normalized channel is available in the Telemetry Ping tables as a top-level field called normalized_channel. For example:

SELECT
  normalized_channel
FROM
  telemetry.crash
WHERE
  DATE(submission_timestamp) = '2019-09-01'
LIMIT
  10