[Statsig] Sample router events (#4143)

src/lib/statsig/events.ts

@@ -24,7 +24,7 @@ export type LogEvents = {
     secondsActive: number
   }
   'state:foreground': {}
-  'router:navigate': {}
+  'router:navigate:sampled': {}
 
   // Screen events
   'splash:signInPressed': {}

src/lib/statsig/statsig.tsx

@@ -85,11 +85,17 @@ export function toClout(n: number | null | undefined): number | undefined {
   }
 }
 
+const DOWNSAMPLED_EVENTS = new Set(['router:navigate:sampled'])
+const isDownsampledSession = Math.random() < 0.9 // 90% likely
+
 export function logEvent<E extends keyof LogEvents>(
   eventName: E & string,
   rawMetadata: LogEvents[E] & FlatJSONRecord,
 ) {
   try {
+    if (isDownsampledSession && DOWNSAMPLED_EVENTS.has(eventName)) {
+      return
+    }
     const fullMetadata = {
       ...rawMetadata,
     } as Record<string, string> // Statsig typings are unnecessarily strict here.