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Log level per request

This blip is not on the current edition of the radar. If it was on one of the last few editions it is likely that it is still relevant. If the blip is older it might no longer be relevant and our assessment might be different today. Unfortunately, we simply don't have the bandwidth to continuously review blips from previous editions of the radar.Understand more
May 2018

One problem with observability in a highly distributed microservices architecture is the choice between logging everything — and taking up huge amounts of storage space — or randomly sampling logs and potentially missing important events. Recently, we’ve noticed a technique that offers a compromise between these two solutions. Set the log level per request via a parameter passed in through the tracing header. Using a tracing framework, possibly based on the OpenTracing standard, you can pass a correlation id from service to service in a single transaction. You can even inject other data, such as the desired log level, at the initiating transaction and pass it along with the tracing information. This ensures that the additional data collected corresponds to a single user transaction as it flows through the system. This is also a useful technique for debugging, since services might be paused or otherwise modified on a transaction-by-transaction basis.