Value of the correlation ID for the server, i.e., a UUID v4 (with or without the dash to separate the blocks), optionally followed by a ‘#’ and a positive integer.
Match pattern:^[0-9A-Fa-f]{8}-?[0-9A-Fa-f]{4}-?4[0-9A-Fa-f]{3}-?[89ABab][0-9A-Fa-f]{3}-?[0-9A-Fa-f]{12}(#[1-9][0-9]*)?$