setProfileKey: Introduce 'reason' parameter for improved logging

ts/models/conversations.ts

@@ -4913,8 +4913,12 @@ export class ConversationModel extends window.Backbone
 
   async setProfileKey(
     profileKey: string | undefined,
-    { viaStorageServiceSync = false } = {}
+    {
+      viaStorageServiceSync = false,
+      reason,
+    }: { viaStorageServiceSync?: boolean; reason: string }
   ): Promise<boolean> {
+    const logId = `setProfileKey(${this.idForLogging()}/${reason})`;
     const oldProfileKey = this.get('profileKey');
 
     // profileKey is a string so we can compare it directly
@@ -4922,9 +4926,7 @@ export class ConversationModel extends window.Backbone
       return false;
     }
 
-    log.info(
-      `Setting sealedSender to UNKNOWN for conversation ${this.idForLogging()}`
-    );
+    log.info(`${logId}: Profile key changed. Setting sealedSender to UNKNOWN`);
     this.set({
       profileKeyCredential: null,
       profileKeyCredentialExpiration: null,
@@ -4935,10 +4937,7 @@ export class ConversationModel extends window.Backbone
     // We messaged the contact when it had either phone number or username
     // title.
     if (this.get('needsTitleTransition')) {
-      log.info(
-        `setProfileKey(${this.idForLogging()}): adding a ` +
-          'title transition notification'
-      );
+      log.info(`${logId}: adding a title transition notification`);
 
       const { type, e164, username } = this.attributes;
 
@@ -5040,7 +5039,7 @@ export class ConversationModel extends window.Backbone
         'deriveProfileKeyVersion: Failed to derive profile key version, ' +
           'clearing profile key.'
       );
-      void this.setProfileKey(undefined);
+      void this.setProfileKey(undefined, { reason: 'deriveProfileKeyVersion' });
       return;
     }