Hi all, I have a question which is mostly on documentation.
I'm interested in providing a multiple-series graph (similar to the ones at the top of a "host report" page) that combines multiple gmetric data. I did have a brief look for docs on how to provide custom "nice" graphs, but didn't find anything. In the past, someone presented some excellent work on providing ad-hoc multiple-series graphs. What I'd like is similar, but I'd like the graph to be permanent, just like with the "Load" and "Memory" graphs. Believing it must be possible, I had a go; I got it to work (more or less), but had to alter one of the "core" PHP file. In brief, I altered templates/default/host_view.tpl to include an extra image with a new graph type (URL was graph.php?g=<name>_report&...) and hacked graph.php to include this new graph type. The end result can be seen here: http://grid04.ph.gla.ac.uk/ganglia/?c=Test%20cluster&h=ppepc65.ph.gla.ac.uk (top right, entitled "ppepc65.ph.gla.ac.uk Apache last hour") Problems with this: 1. Its a bit ugly: I'm having to edit graph.php, rather than specifying the new graph within a template. 2. I'd like to be able to choose whether the new graph to appear on a per-node basis (the template tries to load the new graph for all nodes). 3. It doesn't seem to be documented anywhere (I'd like to know I'm doing this correctly :-) In practise, 2 isn't too great a problem: looking at graph.php?g=apache_report on a node without the relevant gmetric data returns only a single charage-return, so firefox displays nothing. It would be nicer to be able to switch off the image for nodes that don't have that data. So, 1. Is there a best-practise way of doing this? 2. If not, how should I document this for people? Cheers, Paul.
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