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docs/CaseStudies.md: add Fly.io case study

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docs/CaseStudies.md
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@ -15,6 +15,7 @@ where you can chat with VictoriaMetrics users to get additional references, revi
* [CERN](#cern)
* [COLOPL](#colopl)
* [Dreamteam](#dreamteam)
* [Fly.io](#flyio)
* [German Research Center for Artificial Intelligence](#german-research-center-for-artificial-intelligence)
* [Grammarly](#grammarly)
* [Groove X](#groove-x)
@ -246,6 +247,19 @@ VictoriaMetrics in production environment runs on 2 M5 EC2 instances in "HA" mod
2 Prometheus instances are writing to both VMs, with 2 [Promxy](https://github.com/jacksontj/promxy) replicas
as the load balancer for reads.
## Fly.io
[Fly.io](https://fly.io/about/) is a platform for running full stack apps and databases close to your users.
> Victoria Metrics (“Vicky”), in a clustered configuration, is our metrics database. We run a cluster of fairly big Vicky hosts.
> Like everyone else, we started with a simple Prometheus server. That worked until it didn’t. We spent some time scaling it with Thanos, and Thanos was a lot, as far as ops hassle goes. We’d dabbled with Vicky just as a long-term storage engine for vanilla Prometheus, with promxy set up to deduplicate metrics.
> Vicky grew into a more ambitious offering, and added its own Prometheus scraper; we adopted it and scaled it as far as we reasonably could in a single-node configuration. Scaling requirements ultimately pushed us into a clustered deployment; we run an HA cluster (fronted by haproxy). Current Vicky has a really straightforward multi-tenant API — it’s easy to namespace metrics for customers — and it chugs along for us without too much minding.
See [the full post](https://fly.io/blog/measuring-fly/).
## German Research Center for Artificial Intelligence
[German Research Center for Artificial Intelligence](https://en.wikipedia.org/wiki/German_Research_Centre_for_Artificial_Intelligence) (DFKI) is one of the world's largest nonprofit contract research institutes for software technology based on artificial intelligence (AI) methods. DFKI was founded in 1988, and has facilities in the German cities of Kaiserslautern, Saarbrücken, Bremen and Berlin.

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docs/README.md
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@ -36,6 +36,7 @@ Case studies:
* [CERN](https://docs.victoriametrics.com/CaseStudies.html#cern)
* [COLOPL](https://docs.victoriametrics.com/CaseStudies.html#colopl)
* [Dreamteam](https://docs.victoriametrics.com/CaseStudies.html#dreamteam)
* [Fly.io](https://docs.victoriametrics.com/CaseStudies.html#flyio)
* [German Research Center for Artificial Intelligence](https://docs.victoriametrics.com/CaseStudies.html#german-research-center-for-artificial-intelligence)
* [Grammarly](https://docs.victoriametrics.com/CaseStudies.html#grammarly)
* [Groove X](https://docs.victoriametrics.com/CaseStudies.html#groove-x)

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docs/Single-server-VictoriaMetrics.md
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@ -40,6 +40,7 @@ Case studies:
* [CERN](https://docs.victoriametrics.com/CaseStudies.html#cern)
* [COLOPL](https://docs.victoriametrics.com/CaseStudies.html#colopl)
* [Dreamteam](https://docs.victoriametrics.com/CaseStudies.html#dreamteam)
* [Fly.io](https://docs.victoriametrics.com/CaseStudies.html#flyio)
* [German Research Center for Artificial Intelligence](https://docs.victoriametrics.com/CaseStudies.html#german-research-center-for-artificial-intelligence)
* [Grammarly](https://docs.victoriametrics.com/CaseStudies.html#grammarly)
* [Groove X](https://docs.victoriametrics.com/CaseStudies.html#groove-x)