When having performance related issues on environments we'd like to be able to "save" the data of a specific day or days in order to do a proper root cause analysis, even over a longer period of time.
Due to aggregation of data we're now seeing issues arise that after a certain period we're no longer able to access detailed monitoring data of that day through SQL Monitor. Being able to access this data in SQL Monitor helps us correlate this data against other monitoring systems even after aggregation.
Our suggestion would be to add a save button for a specific day or time period where this data is stored and will not be overwritten/aggregated until it is released.