msc: add counters to track call attempts/active/success/failed
active_calls describe all calls in active state.
call.complete Call got terminated by disconnect requested either by MS or MSC.
call.incomplete Call got terminated by any other reason.
call.active Calls reached active state.
Change-Id: I49b93af2e6a0ba16c2fb00b7b83974e8a6a16df3
diff --git a/openbsc/src/libbsc/net_init.c b/openbsc/src/libbsc/net_init.c
index e53b466..57e3599 100644
--- a/openbsc/src/libbsc/net_init.c
+++ b/openbsc/src/libbsc/net_init.c
@@ -86,6 +86,7 @@
/* init statistics */
net->bsc_ctrs = rate_ctr_group_alloc(net, &bsc_ctrg_desc, 0);
net->msc_ctrs = rate_ctr_group_alloc(net, &msc_ctrg_desc, 0);
+ net->active_calls = osmo_counter_alloc("msc.active_calls");
net->mncc_recv = mncc_recv;
net->ext_min = GSM_MIN_EXTEN;