As a Solutions Architect, I work with Cloud Service Providers to get some devices certified by them, During certification process sometimes devices don't work at all hahaha or, some features aren't working properly, so i need to go deep down and take a look inside of the devices to know what the issues are. To be able to know what the issue is, I always take a look at the logs. Logs are like the blood, if you do some blood tests, and doctor go over it, you will know how good your health is, right? logs works as blood for IT systems.
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