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YOU CAN’T TEST EVERYTHING
BUT YOU SHOULD MONITOR IT!
OpenSearchCon Europe 2024
Our journey to OpenSearch
Hi, I am Michi!
Head of Code at
@michilehr
"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
Photo Booth
Cycle
Photo Booth
Cycle
The Incident
Photo Booth
Cycle
Good
~12 MB/s
Bad
0.95 MB/s
🤦
- Hardware error
- Bug in code
- Network
- OS
What could it be?
Transferring some sample
data was fast
What could it be?
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 chart
Many
hours
later
Started long time ago…
What happened?
First day at the new warehouse
Network configuration error
How to prevent or test?
How to notice early?
🤔
Metrics
💡
But HOWto notice early?
Monitoring
and
Alerts!
Monitor
Monitor Data Source
Monitor Data Source Query
Monitor Data Source Query Trigger
Monitor Data Source Query Trigger Notification
Online Photo Booths alert
What else?
404 monitoring
What’s Next?
YOU CAN’T TEST EVERYTHING
BUT YOU SHOULD MONITOR IT!
Thank you for your time!
Questions?
Feedback?
Notes?

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You cant Test everything, but you should monitor it (OpenSearchCon)