Starting in v2.4, LogTail can also notify you when an enabled filter rule matches a line in the log file.
The notifications are shown as alerts or banners by the Mac OS X system at the top right corner when the LogTail
app is not the active application (i.e. not in the foreground).
Note that notifications are sent, but not shown if the app is already in the foreground.
To enable notifications for a particular rule, enable the 'Alert on match' checkbox and specify
the frequency at which the alerts should be shown.
The frequency field controls how often the alerts are shown when matches are found to the enabled rules.
If the value is 'Once', then the alert is fired only the first time there is a matching text found. This is useful if you only care
to know if there is any occurrence of a configured filter search text in the log file. Subsequent matches of the search
text are not sent as alerts.
If the value is 'Always', then the alert is fired for every occurrence of the search text in the log line. Note that
if the search text occurs many times frequently, then there will be many notifications shown in the Notification Center.
Clicking on the notification when it is displayed or from the Notification Center opens LogTail and scrolls to the line
with the matching text.