Add SSL and non-SSL connection OK metrics for PostgreSQL monitor connections

Adds two new metrics, ssl_connections_OK and non_ssl_connections_OK, to improve visibility into PostgreSQL monitor connection status.

include/PgSQL_Monitor.hpp

@@ -39,6 +39,8 @@ struct PgSQL_Monitor {
 	uint64_t ping_check_OK { 0 };
 	uint64_t readonly_check_ERR { 0 };
 	uint64_t readonly_check_OK { 0 };
+	uint64_t ssl_connections_OK { 0 };
+	uint64_t non_ssl_connections_OK { 0 };
 	///////////////////////////////////////////////////////////////////////////
 
 	std::vector<table_def_t> tables_defs_monitor {

lib/PgSQL_Monitor.cpp

@@ -637,6 +637,13 @@ pair<short,bool> handle_async_connect_cont(state_t& st, short revent) {
 		case PGRES_POLLING_OK:
 			pgconn.state = ASYNC_ST::ASYNC_CONNECT_END;
 
+			// connection successful, update SSL stats
+			if (PQsslInUse(pgconn.conn)) {
+				__sync_fetch_and_add(&GloPgMon->ssl_connections_OK, 1);
+			} else {
+				__sync_fetch_and_add(&GloPgMon->non_ssl_connections_OK, 1);
+			}
+
 			if (st.task.type == task_type_t::connect) {
 				st.task.end = monotonic_time();
 			} else if (st.task.type == task_type_t::ping) {

lib/PgSQL_Thread.cpp

@@ -4482,6 +4482,18 @@ SQLite3_result* PgSQL_Threads_Handler::SQL3_GlobalStatus(bool _memory) {
 			pta[1] = buf;
 			result->add_row(pta);
 		}
+		{
+			pta[0] = (char*)"PgSQL_Monitor_ssl_connections_OK";
+			sprintf(buf, "%lu", GloPgMon->ssl_connections_OK);
+			pta[1] = buf;
+			result->add_row(pta);
+		}
+		{
+			pta[0] = (char*)"PgSQL_Monitor_non_ssl_connections_OK";
+			sprintf(buf, "%lu", GloPgMon->non_ssl_connections_OK);
+			pta[1] = buf;
+			result->add_row(pta);
+		}
 		/*
 		{
 			pta[0] = (char*)"MySQL_Monitor_replication_lag_check_OK";