Update gems

Update to latest gems.
Signed-off-by: Ben Kochie <superq@gmail.com>

Add release 2.6 of Prometheus

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

Signed-off-by: JoeWrightss <zhoulin.xie@daocloud.io>

Signed-off-by: Julius Volz <julius.volz@gmail.com>

Signed-off-by: Brian Brazil <brian.brazil@robustperception.io>

Signed-off-by: yuchang <yuchang@360.cn>

Signed-off-by: Pierre Tessier <puckpuck.com@gmail.com>

Signed-off-by: stuart nelson <stuartnelson3@gmail.com>

Signed-off-by: Tom Wilkie <tom.wilkie@gmail.com>

Add release 2.5 of Prometheus

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

Remove FreshTracks, since the company shut down

See https://blog.freshtracks.io/swan-song-96ce02ef854fSigned-off-by: Julius Volz <julius.volz@gmail.com>

Signed-off-by: Tom Wilkie <tom.wilkie@gmail.com>

Signed-off-by: Nico Schmoigl <github@schmoigl-online.de>

* Add VictoriaMetrics to remote storage integrations

Mention that VictoriaMetrics supports direct PromQL querying.
Signed-off-by: Aliaksandr Valialkin <valyala@gmail.com>

* Removed the confusing part about remote read support for VictoriaMetrics

VictoriaMetrics doesn't support remote read API, so remove that part
Signed-off-by: Aliaksandr Valialkin <valyala@gmail.com>

Signed-off-by: Adel Abdelhak <adel.abdelhak.lille@gmail.com>

Signed-off-by: Jelmer Vernooij <jelmer@jelmer.uk>

Signed-off-by: Arno Uhlig <arno.uhlig@sap.com>

Update mailing lists

Signed-off-by: Fabian Reinartz <freinartz@google.com>

The Markdown parsing on prometheus.io/docs interprets these two underscores, but I should not. (GitHub does not)

@brian-brazil, I suppose this qualifies as a trivial change.
Signed-off-by: Arnaud Venturi <arnaud.venturi@rez-gif.supelec.fr>

Signed-off-by: Richard Hartmann <richih@debian.org>

Signed-off-by: Richard Hartmann <richih@debian.org>

Signed-off-by: Guido García <guido.garciabernardo@telefonica.com>

Signed-off-by: Vanush "Misha" Paturyan <ektich@gmail.com>

Change strings to secrets in alertmanager config docs

Signed-off-by: Daniel Kessler <daniel@dkess.me>

* docs/alerting: add tls_config for SMTP
* docs/alerting: update PagerDuty configuration
Signed-off-by: Simon Pasquier <spasquie@redhat.com>

Signed-off-by: Paul "LeoNerd" Evans <leonerd@leonerd.org.uk>

Signed-off-by: Queeny <jinkun@pingcap.com>

Signed-off-by: VirtualTam <virtualtam@flibidi.net>

* Added link to AWS SNS forwarder in integrations docs.
Signed-off-by: Grodzki Olgierd <olgierd.grodzki@gmail.com>

* Moved AWS SNS forwarder to top of the list.
Signed-off-by: Grodzki Olgierd <olgierd.grodzki@gmail.com>

Signed-off-by: dalance <dalance@gmail.com>

Signed-off-by: Elisey Zanko <elisey.zanko@gmail.com>

Signed-off-by: Marian Steinbach <marian@giantswarm.io>

Frankly, I would prefer to list both as they have quite different
approaches. Lovoo's exporter runs on the IPMI-supervised host and uses
the `dev/ipmi0` device to server metrics. This is straight-forward but
doesn't work if the host is powered down. However, in some secnarios,
it's the whole point of IPMI to be able to work with machines while
they are powered down or stuck in the boot process. If you need
metrics in those scenarios, too, the SoundCloud exporter works
better. It uses the blackbox exporter approach and is thus (arguably)
a tad more complicated to set up.

If I _had_ to choose one and only one IPMI exporter, I would pick the
SoundCloud one as it covers all scenarios.  Since @brian-brazil
insisted so far to only ever list one solution for a certain thing to
export, this commit _replaces_ the Lovoo exporter by the SoundCloud
exporter.

Discuss!
Signed-off-by: beorn7 <beorn@soundcloud.com>