How to monitor Firestore rules errors?

Question

I just found out that 10% of my Firestore requests go in error:

These are my rules:

service cloud.firestore {
  match /databases/{database}/documents {
    match /notifications/{notification} {
      allow read, delete: if request.auth.uid == resource.data.authUID;
      allow create, update: if request.auth.uid == request.resource.data.authUID;
    }
    match /various/{doc} {
      allow read, write: if request.auth != null;
    }
  }
}

How can I monitor which are these errors?
Or can you see anything particularly wrong in the rules definitions, which can cause errors?

UPDATE:
I have modified the rules according to what @Mises said, but I still get the errors:

service cloud.firestore {
  match /databases/{database}/documents {
    match /notifications/{notification} {
      allow read, delete, update: if request.auth != null && resource.data != null && request.auth.uid == resource.data.authUID;
      allow create: if request.auth != null && request.auth.uid == request.resource.data.authUID;
    }
    match /various/{doc} {
      allow read, write: if request.auth != null;
    }
  }
}

Answer 1

Firebase console only provides an at-a-glance view of rules invocations. Is not possible to get error logs about specific parts of your security rules that fail.

You could enable and disable rules at a time to test which one is producing errors using one of these tools:

• Rules playground in the Firebase console.
• Emulator suite and its debug function.