Greetings, 

We have set remote read and write to InfluxDB and that is working just 
fine, Prometheus Command-Line Flags are after the question. Path of Data is 
/var/lib/prometheus and as I understood it,
by retention it should be 1s or 0B by size, when we drop the InfluxDB 
Database there is still few hours of Data stored in var/lib/prometheus and 
the size is about 500MB. 

Why there is still 500MB of data in var/lib/prometheus folder? Am I doing 
something wrong with Flags?
Command-Line Flags
alertmanager.notification-queue-capacity 10000
alertmanager.timeout 10s
config.file /etc/prometheus/prometheus.yml
log.format logfmt
log.level info
query.lookback-delta 5m
query.max-concurrency 20
query.max-samples 50000000
query.timeout 2m
rules.alert.for-grace-period 10m
rules.alert.for-outage-tolerance 1h
rules.alert.resend-delay 1m
storage.remote.flush-deadline 1m
storage.remote.read-concurrent-limit 10
storage.remote.read-sample-limit 50000000
storage.tsdb.max-block-duration 100ms
storage.tsdb.min-block-duration 2h
storage.tsdb.path /var/lib/prometheus/
storage.tsdb.retention 15d
storage.tsdb.retention.size 0B
storage.tsdb.retention.time 1s
storage.tsdb.use-lockfile false
storage.tsdb.wal-segment-size 0B
web.console.libraries /etc/prometheus/console_libraries
web.console.templates /etc/prometheus/consoles
web.cors.origin .*
web.enable-admin-api true
web.enable-lifecycle false
web.external-url 
web.listen-address 0.0.0.0:9090
web.local-assets /usr/share/prometheus/web/
web.max-connections 512
web.page-title Prometheus Time Series Collection and Processing Server
web.read-timeout 5m
web.route-prefix /

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