Hi all,

I am doing analysis of a Kubernetes cluster and because I don't have 
permanent access to it, I thought about this idea of importing Prometheus 
TSDB and analyze the data using a local Prometheus instance. I succeeded to 
do that using snapshots as told here 
<https://www.robustperception.io/taking-snapshots-of-prometheus-data>. I 
dumped the snapshot into my local machine, spawned up a Prometheus 
container setting tsdb.path to the snapshot's path and it worked great, I 
can see the old data and perform queries. One night after, I woke up, 
uncompressed the snapshot again and launched a fresh new Prometheus 
instance but unfortunately now I can't see the old data. I have no idea why.

The documentation <https://prometheus.io/docs/prometheus/1.8/storage/> says 
something about heap-size and memory-chunks but that's doesn't work and 
arguments are invalid when I tried them. 

I noticed after the server is launched, the head is garbage collected and 
maybe this is the reason but honestly I have no idea.

So please is there anyway to correct this issue and be able to use my old 
restored snapshot ?

Thanks

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