Node exporter configuration

Documentation

github	https://github.com/prometheus/node_exporter
disabled collectors	https://github.com/prometheus/node_exporter#disabled-by-default
metric-value exposition formats	https://prometheus.io/docs/instrumenting/exposition_formats/

Textfile Collectors

Run a batch job that dumps metrics to a file, and configure the node-exporter to expose it.
Define a collector directory, and *.prom files will be exposed with the node metrics.

When your service starts node_exporter, ensure it sets a collector.textfile.directory

node_exporter --collector.textfile.directory=/path/to/textfiles-dir

Afterwards, simply copy *.prom files to it, to expose their metrics.
It is safest to copy after the file has finished being written successfully.

echo "current_time $(date +%s)" > /var/tmp/current_time.prom
mv /var/tmp/current_time.prom /path/to/textfiles-dir/current_time.prom

Metrics are expressed using exposition formats.
All metric values must be numeric.

WARNING:

You cannot push the same metric to multiple .prom files.