The only difference is we don't log any of that information until it becomes useful, and then we package it with our server-error or client-error logs. ![]() For our web clients, we store enough recent redux actions that we can see how a user got into an error state. For our backend web servers, that data is the current request, the user making the request, and database requests the server is currently making. Rather than doing that, we instead keep a record of useful actions & info, and log those actions and info out whenever we log a server or client error. Many teams add INFO and DEBUG logs on the off-chance that they'll turn out to be useful, and when something goes wrong in production, they can temporarily turn on that detailed logging to try and debug. In general, INFO and DEBUG logs are useful when we run into a system error that we want to understand better, or when we're trying to understand a phenomenon. What do people use INFO and DEBUG logs for? This gives us many of the visibility benefits of a microservices architecture while letting us continue to maintain a single monolith. This lets us set up per-team error budgets, and gives each team an easy way to search through the things that they care about. Those situations shouldn't be treated as if something went wrong: those are times when something went right! We likely want to instrument and alert on these failures, but they don't count as errors for our application.įinally, we want to route both server-errors and client-errors to the correct team, so we've decorated all of routes with a product area, and use that product area to tag these server/client-error logs with the appropriate team. There are plenty of times when a dependency throws or logs an error that we're able to easily recover from. Just because something is a 4xx doesn't mean it's necessarily a client-error: we often have routes that have expected 4xx responses.Īdditionally, just because a dependency errored, doesn't mean that counts as an error for our application. Separating these out lets us alert on appropriate levels separately, and makes it easier to route these logs to the right team. If something can't be fixed, then it's not an error: it's part of the system that we need to instrument and design around. What's the ERROR with ERROR logs?ĮRROR is a pretty broad category! For our team, we find it's useful to divide into errors that should be fixed on the web-server (server-errors: these are normally 5xxs), and integration errors that should be fixed on a client (client-errors: these are normally 4xxs). ![]() At ClassDojo, we divided our logs into server-errors, client-errors, and sampled-investigation-logs, and added tags to route logs in these categories to the team & person who's best suited to handle them. Having a standard logging taxonomy is incredibly useful when you're dealing with logs for many different systems, but for backend web-servers, these syslog-based divisions aren't necessarily actionable or easily searchable it's better to create categories that map to how you want to handle the logs. The standard syslog-based way to handle logs is to divide logs into categories like FATAL, ERROR, WARN, INFO, and DEBUG and use those categories to adjust which logs you see. ERROR, WARN, and INFO aren't actionable logging levels
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