Regarding the SMgr Resource Unavail counter, it will increase if the following conditions are met :
MME receiving Cancel Location Request from HSS before we send the Attach Accept to UE which is resulting in Attach Reject with cause Network Failure.
increments when an Attach Reject message is sent due to session recovery with a cause code of "Network Failure". we need to check if any
Cancel Location Request from HSS received for same mme when Update Location Request is sent from MME. (will result in incrementing Sessmgr resources unavailable stat).
To confirm this we need some s1 and s6a traces.
Cancel request might be coming for a different diamproxy which indicates the HSS had not cleared the state for the given subscriber which was implicitly detached after the node reload.
From the specs:
If the Update Location Request is received over the S6a interface, the HSS shall send a Cancel Location Request with a Cancellation-Type of MME_UPDATE_PROCEDURE (CLR; see chapter 7.2.7) to the previous MME (if any) and replace the stored MME-Identity with the received value (the MME-Identity is received within the Origin-Host AVP).
It is an expected behavior to have those peaks of mme-hss-detach(371) after a reload of a node which has not been offloaded.
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