I'd like rrdtool-2 to come with some sort of query tool which returns the actual values and timestamps where a criteria was met, e.g. where the value of a DS was above a certain threshold, or when it was NaN. I know that you can achieve this with rrdtool-1 and a handcrafted graph with e.g. vertical bars, or filtering all data using a Perl script. But it would be handy as a native function of rrdtool-2 for hunting errors, spikes, missing data points, and so on.
I'd like rrdtool-2 to come with some sort of query tool which returns the actual values and timestamps where a criteria was met, e.g. where the value of a DS was above a certain threshold, or when it was NaN. I know that you can achieve this with rrdtool-1 and a handcrafted graph with e.g. vertical bars, or filtering all data using a Perl script. But it would be handy as a native function of rrdtool-2 for hunting errors, spikes, missing data points, and so on.