slog-async: logger dropped messages due to channel overflow

[rushmorem]

I'm seeing error messages like "ERRO slog-async: logger dropped messages due to channel overflow, count: 15" in my logs. Should I be worried?

[dpc]

You are logging faster than your backend can write the logs to the output. The buffer (channel) got full, and slog had to drop couple of logging messages (15).

You have to decide what to do about it. You can eg. increase the size of the buffer: https://docs.rs/slog-async/2.1.0/slog_async/struct.AsyncBuilder.html#method.chan_size which would help if these are just temporary bursts of logs.

You could ignore the problem, and maybe even filter out the messages about it.

Or you could not use async logging, make your app wait every time a message is logged, until it actually hits a disk/network or something.

[rushmorem]

I see. Thanks for the explanation.

[Mem2019]

For anyone who searches the problem, TerminalLoggerBuilder::new().overflow_strategy(OverflowStrategy::Block) solves it.