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Update release document

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releases/0.5.2.md
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@ -2,7 +2,14 @@
## Overview
A quick release to improve postgres support.
A quick release to avoid a bug leading to incredibly large cleanup queue sizes and resulting in high
CPU use. Upgrading to 0.5.2 is recommended for any deployment that recently upgraded to 0.5.0 or
0.5.1.
### Bugfixes
- [At-Most Once Cleanup Jobs](#at-most-once-cleanup-jobs)
### Changes
@ -18,6 +25,27 @@ of pict-rs.
## Descriptions
### At-Most Once Cleanup Jobs
pict-rs 0.5.2 now is smarter about queueing certain cleanup jobs. Previously, it might queue an
arbitrary number of the same cleanup job while under significant load, resulting in many redundant
jobs consuming CPU. The reason for this is pict-rs' strategy for handling variants and proxied media
that hadn't been accessed within the configured timeframe was to queue a job to check every 30
seconds. This is fine in normal conditions, but can be a problem after upgrading to 0.5 from 0.4.
During the upgrade, pict-rs marks all variants as having been accessed at the time of the upgrade,
since this information was not tracked in 0.4. This results in many variants being queued for
cleanup exactly 1 week (or otherwise configured cache duration) after upgrading. When the cleanup
queue fills with these cleanup jobs, it takes longer to process them all than the 30 second window
between queues of the general cleanup jobs, resulting in redundant cleanup jobs that spawn the same
redundant removal jobs, increasing the queue size by the number of outdated variants each time.
By adding an option to the queueing system to mark certain jobs as unique, pict-rs can now ensure
that only one copy of these general cleanup jobs can be queued or running at any given time,
ensuring that all individual variant cleanup jobs will be queued after a general cleanup job runs
before the next general cleanup job is queued.
### Support TLS in Postgres Connections
The postgres repo now supports some new options to enable connecting via TLS. If the postgres
@ -56,6 +84,7 @@ PICTRS__REPO__USE_TLS=true
PICTRS__REPO__CERTIFICATE_FILE=/path/to/ca/certificate.crt
```
### Compiler Version Requirements
pict-rs 0.5.2 now takes advantage of rust's native support for AFIT (Async Fn In Trait) for the