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fixeria uploaded patch set #2 to this change.

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pfcp_peer: detect UPF restart via RTS mismatch in Heartbeat Response

Check the Recovery Timestamp (RTS) in each Heartbeat Response against
the value stored during Association Setup (`rem_rts`).  A mismatch
means the UPF has restarted; log a warning, increment the new
`pfcp.peer_restart counter`, and reset the PFCP association so it is
re-established with the restarted peer.

The `is_integer(ExpRTS)` guard prevents a spurious reset when a stale
Heartbeat Response arrives in the connecting state (where `rem_rts`
is still undefined).

Change-Id: I00a8384db1ea9c38d0ad9ff90b3d45ad86c3a020
---
M doc/manuals/chapters/metrics.adoc
M include/s1gw_metrics.hrl
M src/pfcp_peer.erl
M src/s1gw_metrics.erl
4 files changed, 32 insertions(+), 16 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/erlang/osmo-s1gw refs/changes/90/42490/2

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