Audit logs are a distinct feature.
Excess load can't take down a well-engineered log collection infrastructure. There can be overload, but the backpressure should propagate downstream and senders and intermediaries should buffer locally if needed. Once the collectors are able to catch up again, the spooled messages will be dispatched, and the backlog should recover.
A well-engineered logging system for sites that care about integrity and durability should look a lot like a distributed message queue.
> Audit logs are a distinct feature.
In my experience, this is not always as distinct as one might hope. On multiple occasions in my career, a customer demanded we perform research using our logs to answer, and the information they sought were not in the class of logs that were considered "audit logs" in advance. Everyone chooses differently what qualifies as "audit logs"; it doesn't have an objective definition.
You're only delaying the inevitable. Even with local buffering, you can arrive at a point where you can buffer no more and have either to choke the production workload or start dropping messages.