Recommended Couchbase server logging level

In Couchbase 5.5.1 install I am seeing lot of settings that are in debug mode. What is the optimal debug level recommended from a performance standpoint?

cat /opt/couchbase/etc/couchbase/static_config
{error_logger_mf_dir, “/opt/couchbase/var/lib/couchbase/logs”}.
{path_config_bindir, “/opt/couchbase/bin”}.
{path_config_etcdir, “/opt/couchbase/etc/couchbase”}.
{path_config_libdir, “/opt/couchbase/lib”}.
{path_config_datadir, “/opt/couchbase/var/lib/couchbase”}.
{path_config_tmpdir, “/opt/couchbase/var/lib/couchbase/tmp”}.
{path_config_secdir, “/opt/couchbase/etc/security”}.

{nodefile, “/opt/couchbase/var/lib/couchbase/couchbase-server.node”}.

{loglevel_default, debug}.
{loglevel_couchdb, info}.
{loglevel_ns_server, debug}.
{loglevel_error_logger, debug}.
{loglevel_user, debug}.
{loglevel_menelaus, debug}.
{loglevel_ns_doctor, debug}.
{loglevel_stats, debug}.
{loglevel_rebalance, debug}.
{loglevel_cluster, debug}.
{loglevel_views, debug}.
{loglevel_mapreduce_errors, debug}.
{loglevel_xdcr, debug}.
{loglevel_access, info}.

{disk_sink_opts,
[{rotation, [{compress, true},
{size, 41943040},
{num_files, 10},
{buffer_size_max, 52428800}]}]}.

{disk_sink_opts_json_rpc,
[{rotation, [{compress, true},
{size, 41943040},
{num_files, 2},
{buffer_size_max, 52428800}]}]}.

{net_kernel_verbosity, 10}.
{ipv6, false}.