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Elixir 1.19: Refactor Logger configuration to what Elixir 1.15+ expects

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Elixir 1.19 started emitting warnings about our use of:
config :logger, :console and
config :logger, backends: []
which got split in 1.15 to :default_handler, :default_formatter, and
LoggerBackends.add(backend) respectively.

On Pleroma startup it is now necessary to add the additional logger
backends at runtime (done with configure_logger() in application.ex).
New config key :pleroma, :logger_backends: [] has replaced the older
backends array. The logger_backends package is now used to facilitate
usage of other logger backends besides the default one (:logger_std_h
from OTP).

Warnings were added to Pleroma startup to warn about the usage of
:logger, backends and additional logic was introduced to make addition
of ExSyslogger to admin's configuration less dumb.

Ref: https://hexdocs.pm/logger/1.15.0/Logger.html#module-backends-and-backwards-compatibility
This commit is contained in:
Phantasm 2026-01-10 16:42:09 +01:00 • committed by Phantasm
commit 926cad3a76
6 changed files with 55 additions and 22 deletions
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25
docs/configuration/cheatsheet.md
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@ -858,12 +858,14 @@ Web Push Notifications configuration. You can use the mix task `mix web_push.gen
* ``private_key``: VAPID private key
## :logger
* `backends`: `:console` is used to send logs to stdout, `{ExSyslogger, :ex_syslogger}` to log to syslog
* Logging to console/stdout is done by default, use `{ExSyslogger, :ex_syslogger}` to log to syslog
An example to enable ONLY ExSyslogger (f/ex in ``prod.secret.exs``) with info and debug suppressed:
```elixir
config :logger,
backends: [{ExSyslogger, :ex_syslogger}]
config :pleroma,
logger_backends: [{ExSyslogger, :ex_syslogger}]
config :logger, default_handler: false
config :logger, :ex_syslogger,
level: :warning
@ -871,8 +873,8 @@ config :logger, :ex_syslogger,
Another example, keeping console output and adding the pid to syslog output:
```elixir
config :logger,
backends: [:console, {ExSyslogger, :ex_syslogger}]
config :pleroma,
logger_backends: [{ExSyslogger, :ex_syslogger}]
config :logger, :ex_syslogger,
level: :warning,
@ -883,23 +885,22 @@ See: [logger’s documentation](https://hexdocs.pm/logger/Logger.html) and [ex_s
An example of logging info to local syslog, but debug to console:
```elixir
config :logger,
backends: [ {ExSyslogger, :ex_syslogger}, :console ],
level: :info
config :pleroma,
logger_backends: [ {ExSyslogger, :ex_syslogger}]
config :logger, :ex_syslogger,
level: :info,
ident: "pleroma",
format: "$metadata[$level] $message"
config :logger, :console,
level: :debug,
config :logger, :default_handler,
level: :debug
config :logger, :default_formatter,
format: "\n$time $metadata[$level] $message\n",
metadata: [:request_id]
```
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