> It's as I thought - your data is accurate but rrd has been given a > completely wrong method to derive the graphs. > > Munin graphs for section "Network" do not have to be in a file called > "network" - it's just a category and the plugin defines what web-page > section it must be in. In your case, the relevant plugin is > netstat_multi which doesn't often get installed. It's data source is > "netstat -s" so grep that output for "timeout" to see it. > > Timeouts are cumulative counters, they do not get less till they wrap > around. So to scale them, the plugin gets the rrd file to subtract > previous reading from current reading and divide by the time interval to > get the timeouts/sec. This is all done inside rrd when the data files > are updated (it's quite a lot of magic) > > That plugin sets the graph type to DERIVE > (/etc/munin/plugins/netstat_multi around line 190. I feel it should be > GAUGE or COUNTER. > > The proper reference on rrd is > http://oss.oetiker.ch/rrdtool/doc/rrdcreate.en.html > and the munin docs are > https://munin.readthedocs.org/en/latest/index.html > > You must edit the plugin file and IIRC recreate the rrd, you will lose > all past info (can't be helped). > > > [snip ls output] > > >> P.S. Any other good plugins you'd recommend? > > http://gallery.munin-monitoring.org/ > > Monitoring is highly site-specific so recommendations aren't usually > worth much, but that gallery has LOTS of contributed plugins
Many thanks Alan! - Grant
