We need to monitor the size of a directory (for example the data directory of InfluxDB) to set up alerts in Grafana. As mentioned here: How to configure telegraf to send a folder-size to influxDB , there is no built-in plugin for this.
We don't mind using the inputs.exec section of Telegraf. The directories are not huge (low filecount + dircount), so deep scanning (like the use of du) is fine by us.
One of the directories we need to monitor is /var/lib/influxdb/data.
What would be a simple script to execute, and what are the caveats?
It's possible natively with filecount plugin
[[inputs.filecount]]
directories = ["/var/lib/influxdb/engine/data"]
Output:
> filecount,directory=/var/lib/influxdb/engine/data,host=psg count=424i,size_bytes=387980393i 1652195855000000000