Samples disappear after upgrading to 2.2.0

[ZeeShen]

What did you do?
Upgraded prometheus to 2.2.0 from 2.2.0.rc.1

What did you expect to see?
Prometheus works well

What did you see instead? Under which circumstances?
Data 'lost'

We found the 1st 'data lost' (3.13 13:50 ~ 3.14 02:50) at
Environment

• System information:

  insert output of uname -srm here

• Prometheus version:

  insert output of prometheus --version here

• Prometheus configuration file:

insert configuration here

• Alertmanager configuration file:

insert configuration here (if relevant to the issue)

• Logs:

insert Prometheus and Alertmanager logs relevant to the issue here

[lock]

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