It's based on timeframe and resolution. So if you are looking at the last twenty four hours at one hour resolution you would see 24 data points and the max of each hour. The same series over twenty four hours at the daily resolution would be one value for the 24 hours period. The exception to this is if you use a meter chart which only displays one value per series/splitting no matter the resolution.
suppose that the max of a year is 200s. Along time will this measure always be 200s?
if we see it now .. the max is 200s in February. but if we see this metric in december, will we continue seeing 200s? or it will be lower due to agreggation?
The resolution dictates how a chart represents detailed data. The maximum resolution for live data is 10 seconds. Performance Warehouse data is available at a maximum resolution of 1 minute.
The resolution is set automatically, based on the time frame and chart type you select.
Please check the following link for the resolution and selected timeframe: