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thousands of hosts costs hundreds of thousands of dollars. a few thousands more is a low barrier.

Sumologic, papertrail, logentries (and many more) for cloud logs. Graylog or ELK or Splunk for self hosted logs.

However, logs should never be send to the cloud, they are too sensitive information to outsource. Server metrics + stats are more reasonable.

Agree, stats and logs cover different things. Need both.

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Both metrics and logs are needed for the full picture (plus alerts and a few other things, like RUM and error/exception capture, both on front-end and backend).

Saying that logs should never be sent to the cloud is overly absolute. Some logs should indeed stay behind firewall, but lots of organizations have logs that can be shipped out to services whose features derive all kinds of interesting insights from logs.

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