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s1gw_metrics: add a counter for unexpected PFCP PDUs

Change-Id: I338662d0fe079f1c4222a70c5521eff2d237c793
---
M include/s1gw_metrics.hrl
M src/pfcp_peer.erl
M src/s1gw_metrics.erl
3 files changed, 4 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/erlang/osmo-s1gw refs/changes/35/38535/1

diff --git a/include/s1gw_metrics.hrl b/include/s1gw_metrics.hrl
index 1b54018..77d6a8e 100644
--- a/include/s1gw_metrics.hrl
+++ b/include/s1gw_metrics.hrl
@@ -8,6 +8,7 @@
 -define(S1GW_CTR_PFCP_ASSOC_SETUP_RESP_RX, [ctr, pfcp, assoc_setup_resp, rx]).
 -define(S1GW_CTR_PFCP_ASSOC_SETUP_RESP_RX_ACK, [ctr, pfcp, assoc_setup_resp, rx_ack]).
 -define(S1GW_CTR_PFCP_ASSOC_SETUP_RESP_RX_NACK, [ctr, pfcp, assoc_setup_resp, rx_nack]).
+-define(S1GW_CTR_PFCP_UNEXPECTED_PDU, [ctr, pfcp, unexpected_pdu]).
 -define(S1GW_CTR_S1AP_ENB_ALL_RX, [ctr, s1ap, enb, all, rx]).
 -define(S1GW_CTR_S1AP_ENB_ALL_RX_UNKNOWN_ENB, [ctr, s1ap, enb, all, rx_unknown_enb]).
 -define(S1GW_CTR_S1AP_PROXY_UPLINK_PACKETS_QUEUED, [ctr, s1ap, proxy, uplink_packets_queued]).
diff --git a/src/pfcp_peer.erl b/src/pfcp_peer.erl
index 543dc05..1a9a6cb 100644
--- a/src/pfcp_peer.erl
+++ b/src/pfcp_peer.erl
@@ -219,6 +219,7 @@
             {keep_state, S};
         _ ->
             ?LOG_NOTICE("Rx unexpected PFCP PDU: ~p", [PDU]),
+            s1gw_metrics:ctr_inc(?S1GW_CTR_PFCP_UNEXPECTED_PDU),
             {keep_state, S}
     end;
 
@@ -266,6 +267,7 @@
             {keep_state, S0};
         _ ->
             ?LOG_NOTICE("Rx unexpected PFCP PDU: ~p", [PDU]),
+            s1gw_metrics:ctr_inc(?S1GW_CTR_PFCP_UNEXPECTED_PDU),
             {keep_state, S0}
     end;
 
diff --git a/src/s1gw_metrics.erl b/src/s1gw_metrics.erl
index bba5209..55421e7 100644
--- a/src/s1gw_metrics.erl
+++ b/src/s1gw_metrics.erl
@@ -58,6 +58,7 @@
     ?S1GW_CTR_PFCP_ASSOC_SETUP_RESP_RX,
     ?S1GW_CTR_PFCP_ASSOC_SETUP_RESP_RX_ACK,
     ?S1GW_CTR_PFCP_ASSOC_SETUP_RESP_RX_NACK,
+    ?S1GW_CTR_PFCP_UNEXPECTED_PDU,
     ?S1GW_CTR_S1AP_ENB_ALL_RX,
     ?S1GW_CTR_S1AP_ENB_ALL_RX_UNKNOWN_ENB,
     ?S1GW_CTR_S1AP_PROXY_UPLINK_PACKETS_QUEUED,

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