--- /dev/null
+`BABELTRACE_COMMON_LOG_LEVEL`::
+ Common functions's log level. The available values are the same as
+ for the manopt:babeltrace(1):--log-level option of man:babeltrace(1).
+
+`BABELTRACE_COMPAT_LOG_LEVEL`::
+ Compatibility functions's log level. The available values are the
+ same as for the manopt:babeltrace(1):--log-level option of
+ man:babeltrace(1).
+
+`BABELTRACE_TERM_COLOR`::
+ Force the terminal color support. The available values are:
++
+--
+`AUTO`::
+ Only emit terminal color codes when the standard output and error
+ streams are connected to a color-capable terminal.
+
+`NEVER`::
+ Never emit terminal color codes.
+
+`ALWAYS`::
+ Always emit terminal color codes.
+--