To test the implementation of our metric metadata API, we need to represent various states of metadata in the scrape metadata store. That is currently not possible as the interface and method to set the store are private.
This changes the interface, list and get methods, and the SetMetadaStore function to be public.
Incidentally, the scrapeCache implementation needs to be renamed to match the new signature.
Signed-off-by: gotjosh <josue@grafana.com>
i) Uses the more idiomatic Wrap and Wrapf methods for creating nested errors.
ii) Fixes some incorrect usages of fmt.Errorf where the error messages don't have any formatting directives.
iii) Does away with the use of fmt package for errors in favour of pkg/errors
Signed-off-by: tariqibrahim <tariq181290@gmail.com>
* scrape: Add global jitter for HA server
Covers issue in https://github.com/prometheus/prometheus/pull/4926#issuecomment-449039848
where the HA setup become a problem for targets unable to be scraped simultaneously.
The new jitter per server relies on the hostname and external labels which necessarily to be uniq.
As before, scrape offset will be calculated with regard the absolute time, so even
restart/reload doesn't change scrape time per scrape target + prometheus instance.
Use fqdn if possible, otherwise fall back to the hostname. It adds extra random seed
to calculate server hash to be distinguish on machines with the same hostname, but
different DC.
Signed-off-by: Aleksei Semiglazov <xjewer@gmail.com>
* Add evaluationTimestamp (Last Evaluation) column to display on /rules
Signed-off-by: Will Hegedus <wbhegedus@liberty.edu>
* Add lastScrapeDuration ("Scrape Duration") to display on /targets
Signed-off-by: Will Hegedus <wbhegedus@liberty.edu>
* Updates based on Julius' feedback
Signed-off-by: Will Hegedus <wbhegedus@liberty.edu>
* Update to set timestamp to when eval started (after eval completes)
Signed-off-by: Will Hegedus <wbhegedus@liberty.edu>
* Update /rules to display time since last evaluation
Signed-off-by: Will Hegedus <wbhegedus@liberty.edu>
* Re-order Last Eval/Eval Time to be consistent with targets page
Signed-off-by: Will Hegedus <wbhegedus@liberty.edu>
This adds a per-target cache of scraped metadata. The metadata is only
available for the lifecycle of the attached target. An API endpoint allows
to select metadata by metric name and a label selection of targets.
Signed-off-by: Fabian Reinartz <freinartz@google.com>
