Hi,

I was trying to install logstash on Amazon Linux 2. After installing it, I couldn't start/enable the service. After some debugging, I noticed the systemd configuration installed by /usr/share/logstash/bin/system-install. However, I do my tests and development mostly on AWS t3.nano and this binary is memory intensive and won't work on low memory.

The exit code could have been checked

ActorAdapter will ignore null message with "Adapter function returned null which is not valid as an .."

However, this seems not be documented. For instance, scaladoc/javadoc of pipeToSelf could mention it as well as any other place where adapters are used.

Summa

Hi!

I've found some broken URLs under these people:

• https://github.com/bnb/awesome-developer-streams#bobby-johnson
• https://github.com/bnb/awesome-developer-streams#adron-hall
• https://github.com/bnb/awesome-developer-streams#calvin-allen--coding-with-calvin (Firefox warns for potential security issue & twitch URL actually redirects to https://luv2.dev/live)
• https://github.com/bnb/awe

this should display as same as clicking on queue popup

Expected

<img width="545" alt="Screen Shot 2021-06-02 at 15 21 49" src="https://user-images.githubusercontent.com/12780733/120581058-63776c80-c454-11eb-86fd-0f3ae653

it's becoming more time-consuming and error-prone to manually re-test all the demos following internal refactorings and API adjustments.

now that the API is fleshed out a bit, it's possible to test a large amount of code (non-granularly) without having to simulate all interactions via Puppeteer or similar.

a lot of code can already be regression-tested by simply running all the demos and val