[German]Microsoft has cleaned up some things concerning the Redstone 4 Insider Preview builds this week for and fixed some problems. So let's have a few about the current state.
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The Redstone 4 development branch is supposed to result to Windows 10 version 1803 (Windows 10 April 2018 Update). A release of this Windows version was expected sometime in the first half of April, but this did not happen because of bugs. As a result, Microsoft withdrew the 'never formally announced' release version of Windows 10 Insider Preview Build 17133 and focussed on the release version of Windows 10 Insider Preview Build 17134.
Windows 10 Insider Build 17134 in Release Preview ring
The most important news about the week-end: Microsoft had released the Windows 10 Insider Build 17134 in the Slow Ring for Insiders for testing on Friday (20.4.2018). Dona Sarkar announced that via Twitter.
Hello #WindowsInsiders we have released Build 17134 to the Slow ring! https://t.co/WzGoWBSy3k
— Dona Sarkar (@donasarkar) 20. April 2018
What surprised me, was the 2nd Tweet from Dona Sarkar about 40 minutes minutes later.
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We have also released Build 17134 to the Release Preview ring as well. https://t.co/uNSl9s8ov7
— Dona Sarkar (@donasarkar) 20. April 2018
So Build 17134 has been released in Slow and Release Preview ring. My naive understanding was, that a build is going to be tested intensively in each ring before it's released into the next ring. Here is the ring model, Microsoft has published years ago. 
(Source: Microsoft)
The daily builds are only tested by a few people at Microsoft in the Canary Ring. Only when they approve a build, it will be included in the Operating System Group (OSG) tester group. If an improvement is given there again, further Microsoft employees can test. And only when the release passes successful this ring, a build makes it into the Fast ring. If the build passes this course, it goes into the slow ring – the release preview ring (the level before the general release) does not appear in the diagram above. It was first mentioned (as I remember) only a few months ago.
And I was surprised, that Dona Sarkar didn't announced Build 17124 for Slow and Preview ring in one tweet. So it is a kind of scattered communication, what she did. But maybe there are technical reasons for.
Bug in Windows 10 Insider Build 17134 fixed!
Some users has been affected by a nasty bug in Build 17134 (I've addressed it within my German blog post Windows 10: Insider Preview Build 17134 mit eigenem Bug? ). The bug crashed Settings app in several scenarios. According to Brandon Le Blanc this bug affects only a few users.
An investigation of this issue has determined that this is in fact not "wide spread" based on the data we have. cc @JenMsft https://t.co/uj1gdQiNr2
— Brandon LeBlanc (@brandonleblanc) 19. April 2018
I got mixed feedback within my German blog. Anyway, this bug is fixed, as Dona Sarkar posts here via Twitter.
It's fixed.
— Dona Sarkar (@donasarkar) 21. April 2018
Feature update for Build 17133
German site deskmodder.de mentioned here, that Windows Insider still on Build 17133 received a 'Feature update Windows 10 1803', that updates the installation to Build 17134. So these users are on Windows 10 April 2018 Update, and it seems that Microsoft is testing the 'Feature update Windows 10 1803' install with Insiders.
Some more information
On April 24, 2017 there will be a WatchMixer Live Cast for Windows Insider, which promises a glimpse into the future. Details under this Tweet.
More interesting was the page Flight Hub, which Brandon LeBlanc created and maintains here. He calls it a dashboard, where you can see at a glance which builds are available in which rings or as ISOs.
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