`ctf` plugin
~~~~~~~~~~~~
`BABELTRACE_PLUGIN_CTF_BTR_LOG_LEVEL`::
    Binary type reader's log level. The available values are the same as
    for the manopt:babeltrace(1):--log-level option of
    man:babeltrace(1).

`BABELTRACE_PLUGIN_CTF_METADATA_LOG_LEVEL`::
    Metadata decoder's log level. The available values are the same as
    for the manopt:babeltrace(1):--log-level option of
    man:babeltrace(1).

`BABELTRACE_PLUGIN_CTF_NOTIF_ITER_LOG_LEVEL`::
    Notification iterator's log level. The available values are the same
    as for the manopt:babeltrace(1):--log-level option of
    man:babeltrace(1).