Hi All,
I am having issues with chunks_head directory. I have the tsdb retention 
size to 175 GB, but the chunks_head size is increasing rapidly. now it's  
689 GB.

689G    chunks_head
4.0K    queries.active
18G     wal

ExecStart=/apps/prometheus/prometheus_server/prometheus \
  --config.file=/apps/prometheus/prometheus_server/prometheus.yml \
  --storage.tsdb.path=/apps/prometheus/prometheus_data \
  --storage.tsdb.retention.size=500GB \
  --storage.tsdb.retention.time=180d

Is there any setting I can make to control the chunks_head  space?

Prometheus version is

prometheus, version 2.31.0 (branch: HEAD, revision: 
d4c83da6d252d4edfdbd639fb817ebdb8e9ab2e4)
build user: root395d507f537a
build date: 20211102-10:28:54
go version: go1.17.2
platform: linux/amd64

Every time I have to remove all directories under the chunks_head and 
restart the Prometheus service on that server. 




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