Commits on Feb 15, 2019

1. compact: relax index label checking …

   It is possible that Prometheus will produce time series with duplicate
   labels. E.g.: a{b="2",b="2"} 1
   
   Where such metric is pushed to Prometheus either wittingly or
   unwittingly, the compact process will stall because the check will not
   pass. For example:
   
   {"caller":"main.go:181","err":"error executing compaction: compaction failed: compaction: gather index issues for block /data/compact/0@{monitor="monitor",replica="repl"}/01D34EDQMSQ29RHAC47XGKHGC7: out-of-order label set {**name**="foo",exported_job="vv",host="172_16_226_56",host="172_16_226_56",region="lt",subtask_index="5",task_attempt_id="32e4b047bb768583ff57c709be3b1046",task_attempt_num="8",task_id="688c028a219ff3372f3eecb0ee5811f9",task_name="Source:_foo",tenant="abc",tier="cooltier",tm_id="53b2ed987b08f427dec4ee1465df91fa"} for series 2594231","level":"error","msg":"running command failed","ts":"2019-02-11T13:30:33.901722306Z"}
   
   This commit fixes the mentioned issue. Amend the e2e test to test the
   case when a series has identical labels.

   

   GiedriusS committed Feb 15, 2019
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