1. A method, comprising: receiving, by a processing device of a distributed computer system, a first application layer message associated with a request originated by a client computer system responsive to an action by a user, wherein the first application layer message comprises a transaction identifier identifying a sequence of messages originated by one or more components of the distributed computer system and associated with the request; identifying a pre-defined byte pattern comprised by the first application layer message; and identifying, based on the pre-defined byte pattern, at least one of: a system error associated with the transaction or an application error associated with the transaction.