Question 1

How to set up slog-multi for sending logs to both console and a remote service?

Accepted Answer

Use the Fanout pattern to distribute logs to multiple handlers in parallel, as shown in the README with examples combining stderr and Logstash. Simply pass multiple handlers to slogmulti.Fanout() to broadcast logs simultaneously.

Question 2

slog-multi vs using multiple slog handlers manually: what's the benefit?

Accepted Answer

slog-multi provides structured composition patterns like failover and load balancing that are hard to implement manually, reducing boilerplate and improving reliability. It handles error recovery and conditional routing out-of-the-box, whereas manual setups require custom logic.

Question 3

How to handle sensitive data in logs with slog-multi?

Accepted Answer

Implement middleware pipelines to redact PII, using inline middleware functions to filter attributes before they reach handlers. The README shows a GDPR example where attributes like email are masked in a pipelining chain.

Question 4

Does slog-multi work with Zap or other logging libraries?

Accepted Answer

Yes, through adapter handlers like slog-zap from the samber ecosystem, but it requires additional setup and might not leverage all native features of those libraries. You'll need to integrate these handlers as part of the composition.

Question 5

What are the performance implications of using slog-multi in high-throughput applications?

Accepted Answer

It can introduce overhead due to multiple handler processing; the README recommends careful use, sampling strategies, and monitoring to mitigate costs. For critical paths, consider reducing log volume or using simpler handlers.

Question 6

How to implement custom routing logic based on log attributes?

Accepted Answer

Use the Router pattern with custom predicate functions that inspect record attributes, as illustrated in the region-based routing example. Define conditions using built-in predicates or custom functions to match specific keys and values.

slog-multi

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