Cattle and Pets
Cattle and Pets is a way to help think about compute resources that are involved in providing a service. The resources could be anything from a kubernetes pod to a S3 bucket. Determining which classification you assign determines how you can treat it. With most cloud service providers allowing you to tag a resource, you can use these as filters to see which resources are critical requiring care and attention and those that can be left ( almost ) alone.
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Can be destroyed and replaced at any time without the service failing => Cattle
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Indispensable; destroying and replacing will cause the overall service to fail => Pet