prometheus

Author	SHA1	Message	Date
beorn7	a90d645378	Checkpoint fingerprint mappings only upon shutdown Before, we checkpointed after every newly detected fingerprint collision, which is not a problem as long as collisions are rare. However, with a sufficient number of metrics or particular nature of the data set, there might be a lot of collisions, all to be detected upon the first set of scrapes, and then the checkpointing after each detection will take a quite long time (it's O(n²), essentially). Since we are rebuilding the fingerprint mapping during crash recovery, the previous, very conservative approach didn't even buy us anything. We only ever read from the checkpoint file after a clean shutdown, so the only time we need to write the checkpoint file is during a clean shutdown.	2016-04-15 01:03:28 +02:00
Jonathan Boulle	38098f8c95	Add missing license headers Prometheus is Apache 2 licensed, and most source files have the appropriate copyright license header, but some were missing it without apparent reason. Correct that by adding it.	2016-04-13 16:08:22 +02:00
Fabian Reinartz	306e8468a0	Switch from client_golang/model to common/model	2015-08-21 13:33:38 +02:00
beorn7	ac75dc2812	Avoid archive lookup for known mapped FPs.	2015-05-08 16:39:26 +02:00
beorn7	2235cec175	Handle fingerprint collisions.	2015-05-07 18:17:59 +02:00