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Add required conditions for Logger's metadata to be print #13777

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Merged
merged 3 commits into from
Aug 12, 2024
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Add required conditions for Logger's metadata to be print #13777

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5b885f5
Add required conditions for Logger's metadata to be print.
Krapaince Aug 12, 2024
101b1ef
Address PR #13777 feedbacks.
Krapaince Aug 12, 2024
ad48392
Update lib/logger/lib/logger/formatter.ex
josevalim Aug 12, 2024
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14 changes: 14 additions & 0 deletions lib/logger/lib/logger/formatter.ex
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Expand Up @@ -74,6 +74,20 @@ defmodule Logger.Formatter do
to the current process. The user can configure the backend to choose
which metadata it wants to print and it will replace the `$metadata`
value.

> #### When is user metadata printed? {: .warning}
>
> User's metadata must meet one of the following conditions to be printed:
> * Be a string (`is_binary/1`)
> * Be a number (either `is_integer/1` or `is_float/1`)
> * Be a PID
> * Be an atom
> * Be a reference
> * Be a port
> * Implement the `String.Chars` protocol
>
> If none of the conditions above are `true`, the given metadata get
> discarded.
"""

@type date :: {1970..10000, 1..12, 1..31}
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