field `sign` is unused (unused)

Error return value of `sys.Files.StoreLogs` is not checked (errcheck)

var `defaultLogLevel` is unused (unused)

SA1019: "io/ioutil" has been deprecated since Go 1.19: As of Go 1.16, the same functionality is now provided by package [io] or package [os], and those implementations should be preferred in new code. See the specific function documentation for details. (staticcheck)