Question: I've got an RRDtool graph that has a huge spike after a reboot. I've tried using the popular `removespikes.pl` script on it, but just returns a "No peaks found.!". What's the best way to take care of this?

Answer: 
My normal answer is "You can't edit RRD files." or "You have to use `rrdtool` to dump it, edit the dump and restore it - that's too much work!", but you seem like a nice guy so I'll point you at [rrdEditor](http://www.leith.ie/rrdeditor/) :-)
I've solved it another way: compute the 95 percentile of the data, then apply this to the max height of graph. So you keep your spikes, but you end up with much useful graphs, even without spikes. But it needs some more computing before creating the graph. I can post a gist with PHP code that does it.