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We tried to use the xhttp_prom module, but our Prometheus couldn't read it, because of metrics conflicting with Prometheus data model.
For us, the problem lies in the usrloc module. It exports the following metrics:
usrloc:location-contacts = 0
usrloc:location-expires = 0
usrloc:location-users = 0
usrloc:registered_users = 0
However, Prometheus allows only ascii characters and digits, as well as underscores and colons.
See: https://prometheus.io/docs/concepts/data_model/#metric-names-and-labels
The metrics names should not contain -, so they should get converted to _.
Setup Kamailio with usrloc, xhttp and xhttp_prom module and let Prometheus query it. It will stumble upon the first entry of usrloc module stats.
Either the usrloc module could export its stats with the dash replaced by underscores, or the xhttp_prom module could sanitize the output. The first one would be a breaking change, I guess, making this a change for a major release.
kamailio -vroot@ifens5:/# kamailio -v
version: kamailio 5.3.8 (x86_64/linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled with gcc 7.5.0```
* **Operating System**:
Ubuntu 18.04
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