Question Grafana & Adavanced Monitoring missing Steps

[lucflash]

Hey guys,

is there a way to set the interval of grafana for queries? The report from today or yesterday shows way more steps than the report of last week or previous month.
We monitor several servers in an global grafan installation setup like How to monitor several Plesk Servers with Grafana extension? but we cannot get a more detailed view. Is there a way to do so or is grafana deleting old data and steps automatically?

Thanks in advanced