Add some more logging to make it easier to find branches (#3006)

Since all github events are passed to this endpoint, but we only care about branch events, add some logging so that we can find information about a specific branch in the log explorer easier.

app_dart/lib/src/request_handlers/github/branch_subscription.dart

@@ -41,15 +41,18 @@ class GithubBranchWebhookSubscription extends SubscriptionHandler {
 
     final pb.GithubWebhookMessage webhook = pb.GithubWebhookMessage.fromJson(message.data!);
     if (webhook.event != kWebhookCreateEvent) {
+      log.fine('Github event is not a "create" event, so this event will not be processed');
       return Body.empty;
     }
 
     log.fine('Processing ${webhook.event}');
     final CreateEvent createEvent = CreateEvent.fromJson(json.decode(webhook.payload) as Map<String, dynamic>);
+    log.fine('Handling create request for branch ${createEvent.ref}');
     await branchService.handleCreateRequest(createEvent);
 
     final RegExp candidateBranchRegex = RegExp(r'flutter-\d+\.\d+-candidate\.\d+');
     if (candidateBranchRegex.hasMatch(createEvent.ref!)) {
+      log.fine('Branch ${createEvent.ref} is a candidate branch, creating new commit in the datastore');
       await commitService.handleCreateGithubRequest(createEvent);
     }
 

app_dart/lib/src/service/commit_service.dart

@@ -31,12 +31,14 @@ class CommitService {
     final DatastoreService datastore = datastoreProvider(config.db);
     final RepositorySlug slug = RepositorySlug.full(createEvent.repository!.fullName);
     final String branch = createEvent.ref!;
+    log.info('Creating commit object for branch $branch in repository ${slug.fullName}');
     final Commit commit = await _createCommitFromBranchEvent(datastore, slug, branch);
 
     try {
+      log.info('Checking for existing commit in the datastore');
       await datastore.lookupByValue<Commit>(commit.key);
     } on KeyNotFoundException {
-      log.info('commit does not exist in datastore, inserting into datastore');
+      log.info('Commit does not exist in datastore, inserting into datastore');
       await datastore.insert(<Commit>[commit]);
     }
   }