[Statsig] Send Discover aggregate interactions (#4599)

src/lib/statsig/events.ts

@@ -73,6 +73,22 @@ export type LogEvents = {
     feedType: string
     reason: 'pull-to-refresh' | 'soft-reset' | 'load-latest'
   }
+  'discover:showMore': {
+    feedContext: string
+  }
+  'discover:showLess': {
+    feedContext: string
+  }
+  'discover:clickthrough:sampled': {
+    count: number
+  }
+  'discover:engaged:sampled': {
+    count: number
+  }
+  'discover:seen:sampled': {
+    count: number
+  }
+
   'composer:gif:open': {}
   'composer:gif:select': {}
 

src/lib/statsig/statsig.tsx

@@ -115,6 +115,9 @@ const DOWNSAMPLED_EVENTS: Set<keyof LogEvents> = new Set([
   'home:feedDisplayed:sampled',
   'feed:endReached:sampled',
   'feed:refresh:sampled',
+  'discover:clickthrough:sampled',
+  'discover:engaged:sampled',
+  'discover:seen:sampled',
 ])
 const isDownsampledSession = Math.random() < 0.9 // 90% likely