Can someone provide an example of how you would attach metadata to a process using metatdata/1? If I have a GenServer say that accepts messages with a user_id. Where would I add the user_id to the metadata so that it’s printed in the logging? I’ve been searching the docs and online, but feel I need …

Given the following entry in your config file: config :logger, :console, format: "[$level] $metadata$message\n", metadata: [:module, :function, :my_id] You can do the following; iex(1)> require Logger Logger iex(2)> Logger.info "test" [info] module= function= test :ok iex(3)> Logger.info "test"…

One thing to note about Logger.metadata is that it is set only for the current process. From the documentation Logger — Logger v1.20.2 ## Metadata Metadata to be sent to the Logger can be read and written with the Logger.metadata/0 and Logger.metadata/1 funct…

@minhajuddin That is a good point. Glad you emphasis that. It does, however, lend itself to a model where you have a process for each item in some collection. By setting metadata for that process at startup (presumedly with some id or name) its an easy way to identify the logs for the given item of…

That’s the route I’ve gone thanks to your advice. Very helpful.

Glad I found this, because I was logging like: [warn] | Elixir.Auth.Csrf Error for :auth_csrf_secret in the session: missing. and now: [warn] | module=Auth.Csrf function=valid_session?/1 line=54 | Error for :auth_csrf_secret in the session: missing. This is way better logging. In my opinion sho…

[image] Exadra37: and now: [warn] | module=Auth.Csrf function=valid_session?/1 line=54 | Error for :auth_csrf_secret in To log this I use in runtime.exs: config :logger, :default_formatter, # 18:29:12.987 | error | module=MyApp.Some.Module function=some_function/arity line=some_number | …

To improve the logger metadata I use this function: def enhance_metadata(%{} = metadata) do context_hash = :crypto.hash(:md5, inspect(metadata)) |> Base.encode16() %{ log_id: UUIDv7.generate(), context_hash: context_hash, context: metadata } end And the updated con…

Example of using Logger.metadata

Questions & Help Questions

wfgilman April 26, 2017, 5:21am 3

This is exactly what I was looking for. Thank you!

Logger metadata only relates to the current process; how to set this in a Mix task?