TFS is an excellent ALM/DevOps tool. Very flexible ALM/DevOps tool. You can do a lot with it. A lot. Once in a while though, like with any other tool, you hit a hurdle that prevents you from doing what you and/or the customer is trying to do with TFS. For example, recently I encountered the following error: VS402395: The daily number of work items returned exceeds the trend chart size limit of 1000. An error was caused because the customer was trying to build a chart from a query that returns more than 1,000 work items. I questioned why would they need a chart for a query that big, and the customer seemed to have a good reason to have chart for that many items. I might not agree with that reason, but the customer thought it was important, so I've promised to look into it.
And, of course, if there is a will, there is a way. Especially, if you're dealing with a flexible and feature rich TFS. TFS has a very rich API. And, almost always, if there is something that you cannot do in UI, you can do via API. Just like in this case. Even though, there was no way to by part chart size limit, there is a very straightforward to get it done using API. OK, enough talk. Here is how you can change chart size limit using PowerShell and TFS API:
# Load TFS snapin
if ( (Get-PSSnapin
"The current value of chart size limit is:"
"Changing the chart size limit to 1500 (maximum)…"
"The new setting for a chart size limit is:"
That's it. Have a good day J