Influxdb

Restarting slow daemons

There is a patter for many services and applications: They become alive (start to process incoming connections) some time after they started. If you connect to them at that moment you may be able to connect, but many operations would fail.

How to have a subquery from few queries in Influx?

If you have (f.e.) two queries, you may want to join them and to make a query on top of joined result of both previous queries. How to join them?

Query1:

select mean(value) as mean_rd from…

Avoiding combinatorial explosion in continuous queries in Influx

How not to do CQs, and how to do them right

My small development environment suddenly stops producing performance data. I looked into few places and quickly…

kapacitor-unit — almost perfect

Testing a foundation for stable complexity. The more complex something is the higher is demand for stability, and a single industry-proven way for stability in large (complex) projects is testing.

How to write back Kapacitor alerts into influx

There is a problem: you want to save alerts from Kapacitor back into InfluxDB, but when you use |InfluxDBOut, all you get is original data which had trigger alert with zero information on the alert itself (its level, message, id, etc).

Latency graphs for OSD for influx/grafana

There aren’t much information on Ceph performance metrics. The most of publicly available Nagios checks stuck with ‘ceph health’ output, and the most articles I saw do not go beyond that level, counting 10 ‘most important ceph metrics’.