Send telemetry about storage consistency

This adds telemetry events about basic storage consistency, so we can start to
get an idea of how often IndexedDB eviction occurs in the field.

Fixes element-hq/element-web#9272

src/utils/StorageManager.js

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 import Matrix from 'matrix-js-sdk';
+import Analytics from '../Analytics';
 
 const localStorage = window.localStorage;
 
@@ -37,6 +38,10 @@ function error(msg) {
     console.error(`StorageManager: ${msg}`);
 }
 
+function track(action) {
+    Analytics.trackEvent("StorageManager", action);
+}
+
 export async function checkConsistency() {
     log("Checking storage consistency");
     log(`Local storage supported? ${!!localStorage}`);
@@ -52,6 +57,7 @@ export async function checkConsistency() {
     } else {
         healthy = false;
         error("Local storage cannot be used on this browser");
+        track("Local storage disabled");
     }
 
     if (indexedDB && localStorage) {
@@ -62,6 +68,7 @@ export async function checkConsistency() {
     } else {
         healthy = false;
         error("Sync store cannot be used on this browser");
+        track("Sync store disabled");
     }
 
     if (indexedDB) {
@@ -72,6 +79,7 @@ export async function checkConsistency() {
     } else {
         healthy = false;
         error("Crypto store cannot be used on this browser");
+        track("Crypto store disabled");
     }
 
     if (dataInLocalStorage && !dataInCryptoStore) {
@@ -80,11 +88,14 @@ export async function checkConsistency() {
             "Data exists in local storage but not in crypto store. " +
             "IndexedDB storage has likely been evicted by the browser!",
         );
+        track("Crypto store evicted");
     }
 
     if (healthy) {
         log("Storage consistency checks passed");
+        track("Consistency checks passed");
     } else {
         error("Storage consistency checks failed");
+        track("Consistency checks failed");
     }
 }