In every decent successful project's life, there comes a point when a number of servers starts growing rapidly. A server with an application ceases to cope with the load and you have to phase in another couple of servers and set a load balancer between them. A database which lived comfortably with the application on the server got larger and needs not just a separate machine, but one more for reliability and greater speed. The local theorist team finds out something about microservices, and now instead of one problem with a monolithic application, you have many microproblems.
The number of servers went far beyond several dozens in a blink of an eye, and each of them needs to be monitored, logged, protected from inner ("Whoops, I've accidentally dropped the database") and outer threats.
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