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OmniAUSF Metrics

Metrics are exposed at http://{host}:{prometheus_metrics_port}/metrics (default port 9568).

AUSF Metrics

Metric	Type	Labels	Description
omni_ausf_auth_count	counter	result	UE authentication operations. result is one of initiated (vector obtained, challenge returned), success (RES* matched XRES*), failure (UDM error, malformed vector, or RES* mismatch), resync (an AUTS/SQN resynchronisation was detected and relayed to the UDM), or resync_invalid (a malformed resync blob was dropped)
omni_ausf_nrf_registration_status	gauge	nf_type	NRF registration status (1 = registered, 0 = not registered)
omni_ausf_active_contexts_count	gauge	-	Number of active UE authentication contexts. Live gauge driven by the telemetry event [:omniausf, :ue_contexts, :active], emitted on every context create and delete and on each ContextReaper sweep, so it tracks the current in-flight context count

omni_ausf_active_contexts_count is a live gauge. It is driven by the telemetry event [:omniausf, :ue_contexts, :active], which the AUSF context store emits whenever the set of active contexts changes: on context create, on delete (confirmation, deregister, or authentication-result delete), and on each ContextReaper sweep that reaps idle contexts. The gauge therefore mirrors the current active auth-context count and is safe to alert on and dashboard. The OAM API remains available for cross-checks: GET /api/status/nf (includes an active UE context count) or GET /api/statistics (total / success / failure / pending session counters).

omni_ausf_auth_count covers the primary authentication flow plus the resynchronisation path. The resync and resync_invalid labels count SQN resynchronisation attempts detected on the initiation request (validated-and-relayed, and malformed-and-dropped, respectively). The deregister and authentication-result-delete paths emit their own telemetry events but are not currently attached to any exported Prometheus metric.

Internal telemetry (not a Prometheus metric). The context reaper emits a [:omniausf, :ausf, :context_reap] telemetry event carrying the count of contexts reaped per sweep. This is internal telemetry for operators wiring their own handlers; it is not registered as an exported Prometheus metric.

Example PromQL

• Authentication success rate over 5 minutes: sum(rate(omni_ausf_auth_count{result="success"}[5m])) / sum(rate(omni_ausf_auth_count{result="initiated"}[5m]))

• Authentication failures per second: sum(rate(omni_ausf_auth_count{result="failure"}[5m]))

• AUSF currently registered with the NRF: omni_ausf_nrf_registration_status == 1

• SQN resynchronisation attempts per second (valid vs malformed): sum(rate(omni_ausf_auth_count{result="resync"}[5m])) and sum(rate(omni_ausf_auth_count{result="resync_invalid"}[5m]))

• Active in-flight authentication contexts: omni_ausf_active_contexts_count

For an independent cross-check of the in-flight context count, the OAM API (GET /api/status/nf or GET /api/statistics) reports the same figure.

BEAM VM Metrics

Metric	Type	Description
beam_memory_total	gauge	Total BEAM memory in bytes
beam_memory_processes	gauge	Memory used by Erlang processes
beam_memory_system	gauge	System memory (ETS, atoms, code)
beam_processes_count	gauge	Number of Erlang processes
beam_vm_uptime	gauge	VM uptime in seconds