Increase Monitor History Retention Indefinitely

[cjanz4711]

Please keep monitor uptime data longer than 90 days, ideally, for as long as the monitor has existed. We want to use these monitors to track SLA's for our customers. Basically, if we can grab all history from the status timeline of the monitor then that works - I'm just not sure how long information is stored, as the bar chart will only show a 90-day history.