Function generate_request_id 

pub fn generate_request_id() -> String

Generates a UUID-v4-shaped identifier (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx).

Not cryptographically random and not a spec-compliant UUID (version/variant bits aren’t forced) — built from a monotonic counter mixed with the current time via a splitmix64 finalizer, the same non-crypto technique already used elsewhere in this crate for unique-but-not-secret IDs (e.g. session IDs). Good for correlating log lines across services; do not use this as a security token, session ID, or anywhere uniqueness must be adversarially guaranteed.