[Telemetry] Send an event when users open the toolbar menu

[tdsmith]

Description & Product Manager / Data Scientist User Story

In order to understand whether we can improve the effectiveness of each messaging surface we’re testing in the set-default experiment (#18796), we should understand how many people see our messages at all. This relates to the branch described in #18608.

As a data scientist, I want to know how often users view the toolbar menu. I would like to observe a Glean event each time users view the toolbar menu.

What questions will you answer with this data?

How many users will see, saw, or could have seen the message we will place on the toolbar menu?

Acceptance Criteria

• ENG files a DS JIRA request outlining their methodology. Let's discuss in this ticket if you have any questions.
• DS sign off on instrumentation methodology addressing product questions.
• Event pings can be queried via re:dash
• Event pings can be queried via amplitude
• We are sending telemetry events for the actions listed in the requirements
• We have documented the telemetry
• We have asked a data steward to review the telemetry

┆Issue is synchronized with this Jira Task

[lobontiumira]

Verified on the 4/20 Nightly build with Google Pixel (Android 10) that the following events are visible - ping 30304923-e389-4c4c-a99c-e41518c6afcf:

• toolbar_menu_visible:

{
          "category": "events",
          "name": "toolbar_menu_visible",
          "timestamp": 2429
        }

• default_browser_changed:

{
          "category": "events",
          "name": "default_browser_changed",
          "timestamp": 8631
        }

Glean dashboard
Logcat.txt

@Amejia481 I cannot trigger the "toolbar_menu_clicked". Am I missing something? Thank you!

experiments_default_browser:
  toolbar_menu_clicked:
    type: event
    description: |
      Set default browser was clicked from toolbar menu

[Amejia481]

Thanks @lobontiumira, sorry for no clarifying earlier experiments_default_browser#toolbar_menu_clicked needs the default browser experiments to be setup in the server, that it hasn't be done yet.

I will close the issue as the probes that don't require experiments are working.