This is a follow-up on a post mortem for:  https://docs.google.com/document/d/1XRjoL72S74_GrQ2WqkmvNIe4Tvy970MBc6dHzKr36CE/edit#heading=h.lzjvop3jozc5

In this outage, we misconfigured our the `--retention.raw-resoluteion` was set to below the downsampled retention. This meant that thanos-compactor deleted the raw data before it could downsample it for the lower resolution blocks. 

Goals: 

• Investigate flag validation on thanos-compactor to stop this happening 
• Investigate why the downsampling pass was not executed before the retention deletion