The Prometheus monitoring system and time series database.

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David Kaltschmidt c93e54d240 Adds execution timer stats to the range query ... API consumers should be able to get insight into the query run times. The UI currently measures total roundtrip times. This PR allows for more fine grained metrics to be exposed. * adds new timer for total execution time (queue + eval) * expose new timer, queue timer, and eval timer in stats field of the range query response: ```json { "status": "success", "data": { "resultType": "matrix", "result": [], "stats": { "execQueueTimeNs": 4683, "execTotalTimeNs": 2086587, "totalEvalTimeNs": 2077851 } } } ``` * stats field is optional, only set when query parameter `stats` is not empty Try it via ```sh curl 'http://localhost:9090/api/v1/query_range?query=up&start=1486480279&end=1486483879&step=14000&stats=true' ``` Review feedback * moved query stats json generation to query_stats.go * use seconds for all query timers * expose all timers available * Changed ExecTotalTime string representation from Exec queue total time to Exec total time		8 years ago
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flock	Add missing license headers	10 years ago
httputil	Added go-conntrack for monitoring http connections (#3241)	8 years ago
promlint	Add promlint check for histogram/summary reserved names (#2626)	9 years ago
stats	Adds execution timer stats to the range query	8 years ago
strutil	Revert "Revert the /graph changes."	9 years ago
testutil	Remote storage reads based on oldest timestamp in primary storage (#3129)	8 years ago
treecache	Fix some lint errors (#3334)	8 years ago