stat: add bts.N.num_trx:total

This is similar to bsc.0.num_trx:total but per single BTS.

Related: SYS#5542
Related: I5be1cb470930354c4561cbed301bc50a32484ed9 (osmo-ttcn3-hacks)
Depends: I137992a5479fc39bbceb6c6c2af9c227bd33b39b (libosmocore)
Change-Id: I283d38e7a8c032e274a5bd2fa150ec2c9a7157b4

TODO-RELEASE

@@ -15,3 +15,4 @@ libosmovty	>1.5.1		needs vty_read_config_filep()
 libosmosgsm     >1.5.1          needs GSM_PCHAN_OSMO_DYN
 libosmocore     >1.5.1          RSL_IPAC_EIE_OSMO*, struct osmo_preproc_*
 libosmocore	>1.5.1		needs osmo_str_to_int()
+libosmocore	>1.5.1		needs new osmo_stat_item implementation (omits FIFO size for stat item)

include/osmocom/bsc/bts.h

@@ -175,6 +175,7 @@ enum {
 	BTS_STAT_RSL_CONNECTED,
 	BTS_STAT_LCHAN_BORKEN,
 	BTS_STAT_TS_BORKEN,
+	BTS_STAT_NUM_TRX_TOTAL,
 };
 
 extern const struct osmo_stat_item_desc bts_stat_desc[];

src/osmo-bsc/bsc_stats.c

@@ -162,6 +162,9 @@ void bsc_update_connection_stats(struct gsm_network *net)
 				trx_rsl_connected++;
 		}
 
+		osmo_stat_item_set(osmo_stat_item_group_get_item(bts->bts_statg, BTS_STAT_NUM_TRX_TOTAL),
+				   num_trx);
+
 		num_trx_total += num_trx;
 		trx_rsl_connected_total += trx_rsl_connected;
 

src/osmo-bsc/bts.c

@@ -1311,6 +1311,10 @@ const struct osmo_stat_item_desc bts_stat_desc[] = {
 		{ "ts_borken",
 		  "Number of timeslots in the BORKEN state",
 		  "", 16, 0 },
+	[BTS_STAT_NUM_TRX_TOTAL] = \
+		{ "num_trx:total",
+		  "Number of configured TRX in this BTS",
+		  "" },
 };
 
 const struct osmo_stat_item_group_desc bts_statg_desc = {