Prometheus release candidate 2.21.0-rc.1 is available

[Julien Pivotto]

Hello everyone,

The second release candidate of Prometheus 2.21 has been released,
fixing a performance regression.


About the 2.21 release:

This release has two new service discoveries: Eureka and Hetzner.

The release no longer contains the tsdb binary, a tool used mainly for
debugging Prometheus TSDB. The features of that tool have been moved to
the promtool binary.

Kubernetes discovery supports a new role: EndpointSlices.

Swarm Discovery now exposes services and tasks even if an explicit port
is not set.

This release brings the ability to have composite durations in PromQL,
e.g. avg_over_time(logged_in_users[1h30m]).

Our TSDB has got multiple improvements and bug fixes.

There are many other exciting changes in the release, I encourage you to
look at the full release notes for more details.

- See the full changelog & grab the binaries:
https://github.com/prometheus/prometheus/releases/tag/v2.21.0-rc.1
- See https://quay.io/repository/prometheus/prometheus?tab=tags and
https://hub.docker.com/r/prom/prometheus/tags for container images.

Please help us test this release candidate and provide us with feedback!

Regards,

--
Julien Pivotto
@roidelapluie