Module prom 

Shared Prometheus registry/counter helpers used by per-connector metric structs. Shared Prometheus counter/gauge construction for per-connector metric structs. Replaces the per-file let local; let reg = … boilerplate and reg_c! macros that used to be duplicated in eleven places.

Structs

RegHandle

Borrowed registry handle used during metric-struct construction.

Functions

reg_or_local

RegHandle over registry, falling back to a fresh registry parked in local (which must outlive construction). Pattern: let mut local = None; let reg = reg_or_local(registry, &mut local);