(character) filter listed import metrics by their state,
e.g. the last failed import. one of: downloading, processing, inserting,
unchanged, finished, canceled, failed. optional
running
(logical) if only a list of running imports should
be returned. default: FALSE. optional
start
(integer) requested number of offset records. Default: 0
limit
(integer) requested number of maximum records to be returned.
Default: 10; max: 1000
a named list, with slots offset (integer), limit (integer),
total (integer), result (list), empty (boolean),
and last (boolean). The result slot is a list itself, with any
number of results as named lists