Cut final v2.20.0

Signed-off-by: Nbeorn7 <beorn@grafana.com>

DigitalOcean, Docker Swarm: properly load files

Signed-off-by: NJulien Pivotto <roidelapluie@inuits.eu>

Cut 2.20.0-rc.1

Note that all new lines in the CHANGELOG except the last will
disappear in the final release because they only deal with issues
introduced in 2.20.0-rc.0.

This commit also adds an explanation for the WAL compression becoming
default.

Furthermore, this commit reverts the upgrade to grpc 1.30.0. It was
just a routine upgrade, but because grpc 1.30.0 contains two very
Go-module unfriendly breaking changes that in combination wreak havoc
for anyone importing from the prometheus/prometheus repo while still
depending on 1.29.1, we decided to revert as Prometheus itself doesn't
need the upgrade right now.
Signed-off-by: Nbeorn7 <beorn@grafana.com>

Downgrade grpc to v1.29.1

Signed-off-by: NGanesh Vernekar <cs15btech11018@iith.ac.in>

no panic the head memseries has chunks in it

Signed-off-by: NKrasi Georgiev <8903888+krasi-georgiev@users.noreply.github.com>

Improve docker swarm configuration exemple

Improve to use the unix socket as this is what is enabled by default.
Signed-off-by: NJulien Pivotto <roidelapluie@inuits.eu>

Docker swarm: enable unix socket

discovery/config: add swarmsd config validation.

Signed-off-by: Njohncming <johncming@yahoo.com>

Signed-off-by: NJulien Pivotto <roidelapluie@inuits.eu>

Signed-off-by: NJulien Pivotto <roidelapluie@inuits.eu>

Fixes #7603
Signed-off-by: NJulien Pivotto <roidelapluie@inuits.eu>

Cut 2.20.0-rc.0

Signed-off-by: Nbeorn7 <beorn@grafana.com>

* Replay m-map chunks irrespective of WAL
Signed-off-by: NGanesh Vernekar <cs15btech11018@iith.ac.in>

* More logs
Signed-off-by: NGanesh Vernekar <cs15btech11018@iith.ac.in>

Additionally, implement isolation in collectResultAppender.
Signed-off-by: NJulien Pivotto <roidelapluie@inuits.eu>

Avoid empty mmap files by using .tmp files to write headers

Signed-off-by: NGanesh Vernekar <cs15btech11018@iith.ac.in>

Signed-off-by: NJulien Pivotto <roidelapluie@inuits.eu>

Signed-off-by: NGanesh Vernekar <cs15btech11018@iith.ac.in>

Signed-off-by: NGanesh Vernekar <cs15btech11018@iith.ac.in>

Signed-off-by: NJulien Pivotto <roidelapluie@inuits.eu>

* Fixed race between compact (gc, populate) and head append causing unknown symbol error.

Fixes https://github.com/prometheus/prometheus/issues/7373Signed-off-by: NBartlomiej Plotka <bwplotka@gmail.com>

* Addressed comments.
Signed-off-by: NBartlomiej Plotka <bwplotka@gmail.com>

* Fix avg_over_time with Inf and NaN values
Signed-off-by: NJulien Pivotto <roidelapluie@inuits.eu>

Update dependencies

This reverts commit 30505a20.

It was still RWLock but we never use the read lock..
Signed-off-by: NJulien Pivotto <roidelapluie@inuits.eu>

Note that by just running `make update-go-deps`, the K8s Go client was
set to `k8s.io/client-go v11.0.0+incompatible`. However, that doesn't
play well with `k8s.io/apimachinery v0.18.5`. I the manually changed
the Go client line to `k8s.io/client-go v0.18.5`, which made
everything work. I guess Go Modules got confused by the ginormous
v11.0.0 version tag. Or it is a problem that pulling k8s.io/client-go
with git results in a rather old repo without the v0.18.5
tag. github.com/kubernetes/client-go has all the right tags. I
actually don't understand how Go Modules still correctly figures out
the source from the `k8s.io/client-go v0.18.5` line.

If one of the reviewers could enlighten me, I'd much appreciate it.
Signed-off-by: Nbeorn7 <beorn@grafana.com>

* Display dates as well as timestamps in the status page
Signed-off-by: NSylvain Rabot <sylvain@abstraction.fr>

* Trim trailing whitespaces
Signed-off-by: NSylvain Rabot <sylvain@abstraction.fr>

Signed-off-by: NJulien Pivotto <roidelapluie@inuits.eu>

Update docker example in migration guide

We were missing testing on the behaviour of the configuration
unmarshalling.

This PR adds a refresh command that can be used to test that we
use the correct refresh function.
Signed-off-by: NJulien Pivotto <roidelapluie@inuits.eu>

Signed-off-by: NGuangwen Feng <fenggw-fnst@cn.fujitsu.com>

Signed-off-by: NCallum Styan <callumstyan@gmail.com>