Packaged manticore version in CentOS7 writes everything into syslog. I think it should be done only in debug mode. Also, this log contains console color sequences which does not work in txt file, e.g.
Jan 15 14:21:28 localhost manticore: #033[90mGET /api/users/me #033[36m304 #033[90m5ms#033[0m
Jan 15 14:21:28 localhost manticore: #033[90mGET /config #033[36m304 #033[90m2ms#033[0m
Jan 15 14:21:28 localhost manticore: #033[90mGET /api/users/me #033[32m200 #033[90m6ms - 207b#033[0m
Jan 15 14:21:28 localhost manticore: #033[90mGET /api/users/me #033[36m304 #033[90m8ms#033[0m