- 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
ioredis may reuse the error instance for multiple callbacks. E.g. when
the connection to redis fails, the queue is flushed with the same
MaxRetriesPerRequestError instance.
