[#24725] YSQL: Make the connection manager log file name of the PG fo…

…rmat

Summary:
Before this revision, the connection manager logs used to go in `ysql-conn-mgr.log` file in the tserver logs directory.

This revision updates the log file format to `ysqlconnmgr-YYYY-MM-DD_HHMMSS.log` format which is also used by PG.
Jira: DB-13804

Test Plan:
Jenkins: compile only
Manually tested with creating a cluster and checking the file name.

Reviewers: skumar, rbarigidad, mkumar

Reviewed By: skumar

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D39604

src/yb/yql/ysql_conn_mgr_wrapper/ysql_conn_mgr_conf.cc

@@ -264,10 +264,15 @@ void YsqlConnMgrConf::UpdateConfigFromGFlags() {
 
 YsqlConnMgrConf::YsqlConnMgrConf(const std::string& data_path) {
   data_dir_ = JoinPathSegments(data_path, "yb-data", "tserver");
-  log_file_ = JoinPathSegments(FLAGS_log_dir, "ysql-conn-mgr.log");
   pid_file_ = JoinPathSegments(data_path, "yb-data", "tserver", "ysql-conn-mgr.pid");
   ysql_pgconf_file_ = JoinPathSegments(data_path, "pg_data", "ysql_pg.conf");
 
+  // Generate the log file name based on the current time.
+  auto now = std::time(/* arg= */ nullptr);
+  auto* tm = std::localtime(&now);
+  char buffer[64];
+  buffer[strftime(buffer, sizeof(buffer), "ysqlconnmgr-%Y-%m-%d_%H%M%S.log", tm)] = 0;
+  log_file_ = JoinPathSegments(FLAGS_log_dir, buffer);
 
   UpdateConfigFromGFlags();