You cant Test everything, but you should monitor it

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We had an incident which did occur in our warehouse at KRUU. The downloading of the photos was very slow from one to the other day - well we thought that the problem started on this day. Actually we did notice this very late and the problem started two years ago but we did notice this very late due to the reduced rentals because of Covid19. This will never happen again thanks to our new metrics and alerting powered by the OpenSearch!

Software

Hi, I am Michi!
Head of Code at
@michilehr

YOU CAN’T TEST EVERYTHING
BUT YOU SHOULD MONITOR IT!
11. October 2022 @ Nerd-BBQ

"As Europe's leading photo booth provider, we have
made it our mission to help our brides and grooms
with their complete journey to their dream wedding.
This is something we work tirelessly on with our
team."
What is doing?
Philipp Schreiber - Co-Founder, KRUU.com

1. When did it start?
2. Why did it happen?
3. How to prevent?
4. How to notice early?
Investigate

When did it start?
We had data in our Slack Channel, but…

1. Write a script to extract the data as CSV
2. Import data to MySQL
3. Write query to aggregate by day
4. Create nice graph

What happened?
Network conﬁguration error

How to prevent?
No idea. Things like this happen

● 404 alert by threshold
● Auth failure alert by threshold to
detect brute force
● …
What next?

Thank you for your time!
Questions?
Feedback?
Notes?

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