@tanweerdev what is your Elixir version? Sentry expects a particular metadata to be available for logging that was only recently added to Elixir.

You can also ask Sentry to capture all log messages. Here is what I do:

config :logger, Sentry.LoggerBackend,
  level: :warn,
  excluded_domains: [:cowboy],
  capture_log_messages: true

Note you likely don’t want to configure this in your config/config.exs, as Sentry.LoggerBackend may be loaded even before it is compiled. This will definitely be the case in umbrella projects if only part of them depend on Sentry. Instead, call Logger.add_backend(Sentry.LoggerBackend) in your application start/2 callback.

I confirm I’m getting sentry via Task.start in this case:

1. Create new project
2. Add sentry dep
3. Add sentry logger backend (no other configuration)

config :logger,
  backends: [:console, Sentry.LoggerBackend]

config :sentry, dsn: "http://a:b@127.0.0.1:8000/1"

4. Add following to a controller function

    Task.start(fn ->
      MyModule.function()
    end)

With or without phoenix integration, it sends a request - but it does not print sentry log.

I ran dummy server with python3 -m http.server 8000 --bind 127.0.0.1 to see whether my phoenix app actually sends a request.