Track inbound response time at a bare minimum. Once you’ve done that, follow with error rates and then start working on application-level metrics. Track the health of all downstream responses, at a bare minimum including the response time of downstream calls, and at best tracking error rates. Libraries like Hystrix can help here. Standardize on how and where metrics are collected. Log into a standard location, in a standard format if possible. Aggregation is a pain if every service uses a different layout! Monitor the underlying operating system so you can track down rogue processes and do
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