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Don't count empty collection as success (#1613)

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Many collectors depend on underlying features to be enabled. This causes
confusion about what "success" means. This changes the behavior of the
`node_scrape_collector_success` metric.

* When a collector is unable to find data don't return success.
* Catch the no data error and send to Debug log level to avoid log spam.
* Update collectors to support this new functionality.
* Fix copy-pasta mistake in infiband debug message.

Closes: https://github.com/prometheus/node_exporter/issues/1323

Signed-off-by: Ben Kochie <superq@gmail.com>
This commit is contained in:
Ben Kochie 2020-02-19 16:11:29 +01:00 • committed by GitHub
commit 3e1b0f1bee
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11 changed files with 26 additions and 12 deletions
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collector/drbd_linux.go
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@ -188,7 +188,7 @@ func (c *drbdCollector) Update(ch chan<- prometheus.Metric) error {
if err != nil {
if os.IsNotExist(err) {
level.Debug(c.logger).Log("msg", "stats file does not exist, skipping", "file", statsFile, "err", err)
return nil
return ErrNoData
}
return err