feat: add user id to sentry (#6896)

* feat: add user id to sentry

* downgrade

* key

* Update src/tracing/index.ts
Co-authored-by: Zach Pomerantz <zzmp@uniswap.org>

* Update src/tracing/index.ts
Co-authored-by: Zach Pomerantz <zzmp@uniswap.org>

* fixes

---------
Co-authored-by: Zach Pomerantz <zzmp@uniswap.org>

src/tracing/index.ts

@@ -6,12 +6,16 @@ import { initializeAnalytics, OriginApplication } from '@uniswap/analytics'
 import { SharedEventName } from '@uniswap/analytics-events'
 import { isSentryEnabled } from 'utils/env'
 import { getEnvName, isProductionEnv } from 'utils/env'
+import { v4 as uuidv4 } from 'uuid'
 
 import { beforeSend } from './errors'
 
 // Dump some metadata into the window to allow client verification.
 window.GIT_COMMIT_HASH = process.env.REACT_APP_GIT_COMMIT_HASH
 
+// This is used to identify the user in Sentry.
+const SENTRY_USER_ID_KEY = 'sentry-user-id'
+
 // Actual KEYs are set by proxy servers.
 const AMPLITUDE_DUMMY_KEY = '00000000000000000000000000000000'
 export const STATSIG_DUMMY_KEY = 'client-0000000000000000000000000000000000000000000'
@@ -31,6 +35,12 @@ Sentry.init({
   beforeSend,
 })
 
+let sentryUserId = localStorage.getItem(SENTRY_USER_ID_KEY)
+if (!sentryUserId) {
+  localStorage.setItem(SENTRY_USER_ID_KEY, (sentryUserId = uuidv4()))
+}
+Sentry.setUser({ id: sentryUserId })
+
 initializeAnalytics(AMPLITUDE_DUMMY_KEY, OriginApplication.INTERFACE, {
   proxyUrl: process.env.REACT_APP_AMPLITUDE_PROXY_URL,
   defaultEventName: SharedEventName.PAGE_VIEWED,