Add missing events to metrics docs

We didn't have a new data review and only added new events that
fall into the same category of data as data we were already
collecting (Category 2, "interaction data"), but it's both good
hygiene to attempt to keep this up-to-date, as well as possibly
interesting to people; hence the update.

METRICS.md

@@ -1,4 +1,4 @@
-_Last updated: May 20 2020_
+_Last updated: March 24 2022_
  
  
 
@@ -36,6 +36,8 @@ This is the Analytics plan for Firefox Relay. It documents our use of Google Ana
 
 >Do users who have not installed the Relay add-on, choose to install the add-on?
 
+>When do users decide to upgrade to Premium?
+
  
 
 ## Extension Event Collection
@@ -117,7 +119,7 @@ We collect data for the following events:
 
 ### Sign Up Buttons & Links
 
-**`Sign In Button`** -   **`Add to Firefox Button`**    **`Join the Waitlist Button`**   
+**`Sign In Button`** -   **`Add to Firefox Button`**  -  **`Join the Waitlist Button`**
 
 - When a button appears on the page
   * `hitType` : event
@@ -152,6 +154,82 @@ We collect data for the following events:
   * `eventAction` : bento-app-link-click
   * `eventLabel` : link identifier
 
+### Interview recruitment
+
+(This is only shown occasionally, when we're trying to recruit people to join in user research.)
+
+- When the recruitment link appears on the page
+  * `hitType` : event
+  * `eventCategory` : Recruitment
+  * `eventAction` : View
+  * `eventLabel` : Recruitment text
+
+- When the recruitment link is clicked
+  * `hitType` : event
+  * `eventCategory` : Recruitment
+  * `eventAction` : Engage
+  * `eventLabel` : Recruitment text
+
+### Net Promoter Score (NPS)/Customer Satisfaction (CSAT) surveys
+
+- When a CSAT survey answer is selected
+  * `hitType` : event
+  * `eventCategory` : CSAT Survey
+  * `eventAction` : submitted
+  * `eventLabel` : The given answer
+  * `value` : A numeric value representing the given answer
+  * `dimension3` : Whether the given answer respresents satisfaction, neutral feeling, or dissastisfaction.
+  * `dimension4` : The given answer
+  * `metric10` : Always "1" (to count the number of answers)
+  * `metric11` : A numeric value representing `dimenstion4`
+  * `metric12` : A numeric value representing `dimenstion3`
+
+- When an NPS survey answer is selected
+  * `hitType` : event
+  * `eventCategory` : NPS Survey
+  * `eventAction` : submitted
+  * `eventLabel` : A label for the category of the given answer
+  * `value` : A numeric value representing the given answer
+  * `dimension1` : A label for the category of the given answer
+  * `metric10` : Always "1" (to count the number of answers)
+  * `metric11` : The given answer
+  * `metric12` : A numeric value representing the category of the given answer
+
+### Banners
+
+- When a user clicks the link in one of the banners
+  * `hitType` : event
+  * `eventCategory` : Outbound
+  * `eventAction` : Click
+  * `eventLabel` : link content
+
+### Links to upgrade to Premium
+
+- When the link appears on the page
+  * `hitType` : event
+  * `eventCategory` : Purchase Button
+  * `eventAction` : View
+  * `eventLabel` : link identifier
+
+- When a user clicks the link
+  * `hitType` : event
+  * `eventCategory` : Purchase Button
+  * `eventAction` : Engage
+  * `eventLabel` : link identifier
+
+### The onboarding flow for new Premium subscribers
+
+- When a button/link to continue to the next step scrolls into view
+  * `hitType` : event
+  * `eventCategory` : Premium Onboarding
+  * `eventAction` : View
+  * `eventLabel` : link identifier
+
+- When a user clicks a button/link to continue to the next step
+  * `hitType` : event
+  * `eventCategory` : Premium Onboarding
+  * `eventAction` : Engage
+  * `eventLabel` : link identifier
 
 ## Opt Out of Google Analytics Tracking
 
@@ -159,6 +237,4 @@ We collect data for the following events:
 
 Before initializing Google Analytics, we check the user's browser settings for a **DNT** signal. If the **DNT** header is enabled, Analytics is never initialized and is not used to collect data for that session.
 
->[How Firefox Relay detects and respects DNT.](https://github.com/schalkneethling/dnt-helper)
-
 >[How do I turn on the Do Not Track feature?](https://support.mozilla.org/en-US/kb/how-do-i-turn-do-not-track-feature)

docs/frontend-architecture.md

@@ -44,7 +44,7 @@ Import tokens from [Protocol](https://protocol.mozilla.org).
 ## Add telemetry
 
 Uses [`react-ga`](https://www.npmjs.com/package/react-ga).
-`useGaPing` and `trackPurchaseStart`.
+See `useGaViewPing` and `trackPurchaseStart`.
 
 ## Add a feature flag