[prometheus-users] prometheus remote_read doesn't work if external_labels added after metric wrote to influxdb

[艾客]

my question:* thanos can't query prometheus old data which have to read 
from influxdb by  remote_read*

env:
    prometheus version=2.6.0
    thanos, version 0.12.2

config:

scrape_configs:
  - job_name: 'federate'
    scrape_interval: 15s
    honor_labels: true
    metrics_path: '/federate'


    params:
      'match[]':
        - '{__name__=~".+"}'


    static_configs:
      - targets:
        - '10.10.44.20:9090'


*Things come from this*
I made a new prometheus cluster with thanos ,but i don't want to delete my 
historical data which stored in influxdb. So i added thanos-sidecar for my 
old prometheus ,also with external_labels configs. but it doesn't work. 
I found the reason was *prometheus query influxdb with the label 
external_labels ,if i removed external_labels, it work, but if to,the 
thanos query will not deduplicat for this prometheus.*

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