UtilsLib.XlogSourceA Logs.LOG module that includes its source
val log_pairs :
src:Logs.src ->
Logs.level ->
((('a -> 'b -> 'c, Format.formatter, unit, unit) format4 ->
(('d -> 'a) * 'd) ->
(('e -> 'b) * 'e) ->
'c) ->
unit) ->
unitset_level ~app l sets the log level to l and provides the name app to the default application log.