Hi all,
I'm working on a web interface which would allow a user to choose which reports metrics to group in a graph, thus forming custom reports. I believe this would be especially useful when viewing gmetrics in a cluster/grid context (nfs_ops/sec anyone? how about a breakdown to read/write/getattr/blah?) I've reached a stage where I have a basic form which provides a list of all available metrics, where each line looks something like this: metric line_width line_color fill_area? area_color The metrics plotted in the output graph are the ones whose checkbox has been checked. Since this is quite basic at this point, there's not much in the way of input validation or eye candies. The issue I'm facing is how to distinguish between memory, network and other metrics. If you take a look at graph.php, at the section responsible for generating memory graphs, you'd find CDEF passed as a parameter to rrdtool, with certain RPN calculations performed in order to display information correctly. While it is possible to hardcode this into the interface for certain metrics, same as with graph.php, it doesn't solve the problem with custom metrics, where the user would have to be provided with a form field where he'd enter RPN syntax to CDEF. Needless to say, that's not too user-friendly, and requires some understanding of how rrdtool works. Does anyone have any ideas on how this could be performed with user-friendliness in mind? perhaps adding a dropdown menu with several common CDEF parameters and calling them "memory/network/blah"? Thanks, Alex
