<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Hi All:</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">
We are using the statsd plugin to report metrics from inside our apps. However, the default behavior of collectd prefixes all metrics with the server's hostname. This means we have our app metrics subdivided by the number of nodes running the app. In our environment, we would really prefer only having aggregate statistics across all nodes running the app. To further complicate things, our chosen data store (InfluxDB via the write_graphite plugin) cannot itself aggregate more then 2 time series. It is likely that this limitation will be lifted in the future, but it seems most efficient to do this before it hits InfluxDB.</div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">It seems there are 3 options for doing this:</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">
<br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">* Use a PreCache filter to strip off the hostname from all statsd plugin metric values</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">
* Run a single collectd instance after all others that uses the aggregation plugin to sum values from all statsd metrics</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">* Run an additional collectd instance on each node with a blank Hostname value, purely for statsd</div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">The first option seems to be the simplest to implement, but it closes the door to analyzing per-host metrics down the road.</div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">The second option seems attractive to overcome this, but bug #297 [1] seems like a blocker for it. I want this metric gathering to be as bullet-proof as possible. The bug is from 5.2; we're running the latest 5.4. Has anyone experienced this issue on the latest versions?</div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">The last option seems like more of a hack, but because collectd is so lightweight it seems feasible. Would it possibly perform better than a single instance always doing checks for the statsd plugin? We're emitting statsd metrics quite frequently.</div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">1. <a href="https://github.com/collectd/collectd/issues/297">https://github.com/collectd/collectd/issues/297</a></div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div>Thanks,<br><br>David Blewett</div>
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