On Fri, May 14, 2021 at 11:58 AM Willy Tarreau <w...@1wt.eu> wrote:
>   - interoperability / protocol support: WebSocket over HTTP/2 (RFC8441)
>     is now supported on both sides, regardless of the version on the other
>     side. The cache now supports the "Vary" header with a few commonly
>     used headers, including "Accept-encoding" which gets normalized for
>     optimal cache hit ratio. The Prometheus exporter got a significant
>     liftup, requires less tricks on the Prometheus side, and supports
>     listing only certain metrics for faster retrieval. Optional native
>     support for Opentracing was also integrated (via USE_OT=1). The DNS
>     resolvers now support talking to servers over TCP. Basic support for
>     extracting information from MQTT and FIX protocol was added. Timeouts
>     can now be adjusted on the fly and per-request in order to adapt to
>     particuarly slow servers or special protocols.

Regarding prometheus, it should probably noted some major changes
regarding some metrics, such as for health check, where the value is
now located in a label, instead of the value of the metric itself:
see also 

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