5.2.18.6 sEPPPn32fPrevLoChkExcepFailAlrtCritical

Table 5-91 sEPPPn32fPrevLoChkExcepFailAlrtCritical

Field Details
Trigger Condition When previous location check exception failure error is detected above 50 Percent of total transactions, this alert will be raised.
Severity Critical
Alert Details Provided
Summary
namespace: {{$labels.namespace}}, timestamp: {{ with query "time()" }}{{ . | first | value | humanizeTimestamp }}{{ end }}
Expression:
sum(rate(ocsepp_previous_location_exception_failure_total{namespace="sepp-namespace"}[2m]))by(namespace,nf_instance_id,app,pod)/sum(rate(ocsepp_previous_location_validation_requests_total{namespace="sepp-namespace"}[2m]))by(namespace,nf_instance_id,app,pod)>=0.5
OID 1.3.6.1.4.1.323.5.3.46.1.2.4037
Metric Name ocsepp_previous_location_exception_failure_total
Resolution The alerts gets cleared when the previous location check exception failure error does not lie above 50 percent of total transactions.

Possible Resolutions:

  1. Look for the following error codes in the PN32F microservice logs:
    • SEPP-PREVIOUS-LOCATION-CHECK-VALIDATION-ERROR-0019
    • SEPP-PN32FSEPP-ERROR-0018
    • SEPP-PREVIOUS-LOCATION-CHECK-VALIDATION-EXCEPTION-0020
  2. Ensure that the correct regex is configured for UE ID and Serving Network ID under the Header or Body IE configuration within the Cat 3 – Previous Location Check section of the Security Countermeasure tab in the SEPP CNC Console.
  3. Check that the MCC and MNC values (configured in either the header or body) match the serving network name. These values are returned in the UDR response, so also confirm that the UDR response is successful.
  4. If Cat 3 – Previous Location Check is enabled, ensure the SUPI is present in the incoming request message.
  5. Verify the following:
    • Confirm the UDR discovery procedure completes successfully.
    • Ensure the FQDN or IP of the UDR is reachable.
    • Verify the Coherence service is up and running.
    • Make sure the SUPI falls within the IMSI range defined in the UDR profile.
  6. Ensure that DNS resolution is properly configured for the UDR discovery call, specifically for the pn32f-svc service used in subscription use cases.