When the box is over 100% capacity start to shed load.
Use 5 min load average to make the system less likely to start moving
projects off after a temporary cpu spike
* wip generate directory for hash content
* cleanup, remove console logging
* add content caching module
* Return PDF stream ranges with compile response
* Return the PDF file size in the compile response
* PDF range endpoint
* [misc] WIP: pdf caching: preserve the m-time on static content files
* [misc] WIP: pdf caching: improve browser caching, emit caching headers
* [misc] WIP: pdf caching: do not emit very small chunks <1kB
* [misc] keep up with moving output files into a separate directory
* [OutputCacheManager] add global feature flag for enabling pdf caching
* [misc] add contentId into the URL for protecting PDF stream contents
* [misc] support PDF stream caching for anonymous users
* [misc] add per-request feature flag for enabling PDF stream caching
* [misc] enable pdf caching in CI and emit metrics at the end of run
* [misc] expose compile stats and timings to the frontend
* [misc] log an error in case saving output files fails
* [misc] add metrics for pdf bandwidth and pdf caching performance
* [misc] add a dark mode to the pdf caching for computing ranges only
* [misc] move pdf caching metrics into ContentCacheMetrics
* [misc] add a config option for the min chunk size of pdf ranges
Co-authored-by: Brian Gough <brian.gough@overleaf.com>
Co-authored-by: Eric Mc Sween <eric.mcsween@overleaf.com>
- renamed package from `metrics-sharelatex` to `@overleaf/metrics`
- drop support for statsd backend
- decaffeinate
- compress `/metrics` response using gzip
- bump debugging agents to latest versions
- expose prometheus interfaces for custom metrics (custom tags)
- cleanup of open sockets metrics
- fix deprecation warnings for header access
