fix(infra): Inline sentry logging config (#8031)

It appears that something is initializing the Sentry.LoggerHandler
before we try to load it when starting:

```
Invalid logger handler config: {:logger,
 {:invalid_handler, {:function_not_exported, {Sentry.LoggerHandler, :log, 2}}}}
```

This doesn't seem to actually inhibit the Sentry logger at all,
presumably because it initializes just fine in the application start
callback.

Instead of defining the config in the `config/` directory, we can pass
it directly to `:logger` on start which solves the above issue.

elixir/apps/domain/lib/domain/application.ex

@@ -8,7 +8,14 @@ defmodule Domain.Application do
     _ = OpentelemetryLoggerMetadata.setup()
     _ = OpentelemetryEcto.setup([:domain, :repo])
 
-    Logger.add_handlers(:logger)
+    # Configure Sentry to capture Logger messages
+    :logger.add_handler(:sentry, Sentry.LoggerHandler, %{
+      config: %{
+        level: :warning,
+        metadata: :all,
+        capture_log_messages: true
+      }
+    })
 
     # Can be uncommented when this bug is fixed: https://github.com/open-telemetry/opentelemetry-erlang-contrib/issues/327
     # _ = OpentelemetryFinch.setup()

elixir/config/config.exs

@@ -232,17 +232,6 @@ config :logger, :default_formatter,
   format: "$time $metadata[$level] $message\n",
   metadata: :all
 
-config :logger, :logger, [
-  {:handler, :sentry, Sentry.LoggerHandler,
-   %{
-     config: %{
-       level: :warning,
-       metadata: :all,
-       capture_log_messages: true
-     }
-   }}
-]
-
 # Use Jason for JSON parsing in Phoenix
 config :phoenix, :json_library, Jason
 

elixir/config/runtime.exs

@@ -236,34 +236,36 @@ if config_env() == :prod do
 
   # Sentry
 
-  api_external_url_host = URI.parse(compile_config!(:api_external_url)).host
-
-  sentry_environment_name =
-    case api_external_url_host do
-      "api.firezone.dev" -> :production
-      "api.firez.one" -> :staging
-      _ -> :unknown
-    end
-
-  sentry_dsn =
-    case api_external_url_host do
-      "api.firezone.dev" ->
-        "https://29f4ab7c6c473c17bc01f8aeffb0ac16@o4507971108339712.ingest.us.sentry.io/4508756715569152"
-
-      "api.firez.one" ->
-        "https://29f4ab7c6c473c17bc01f8aeffb0ac16@o4507971108339712.ingest.us.sentry.io/4508756715569152"
-
-      _ ->
-        nil
-    end
-
+  # Base Sentry config
   config :sentry,
-    dsn: sentry_dsn,
-    environment_name: sentry_environment_name,
+    dsn:
+      "https://29f4ab7c6c473c17bc01f8aeffb0ac16@o4507971108339712.ingest.us.sentry.io/4508756715569152",
+    environment_name: :unknown,
     enable_source_code_context: true,
     root_source_code_paths: [
       Path.join(File.cwd!(), "apps/domain"),
       Path.join(File.cwd!(), "apps/web"),
       Path.join(File.cwd!(), "apps/api")
     ]
+
+  # Environment-specific Sentry overrides
+  if api_external_url = compile_config!(:api_external_url) do
+    api_external_url_host = URI.parse(api_external_url).host
+
+    # Set environment_name based on which API URL we're using
+    sentry_environment_name =
+      case api_external_url_host do
+        "api.firezone.dev" -> :production
+        "api.firez.one" -> :staging
+        _ -> :unknown
+      end
+
+    config :sentry, :environment_name, sentry_environment_name
+
+    # Disable Sentry for unknown environments
+    # Comment this out to enable Sentry in development and test environments
+    if sentry_environment_name == :unknown do
+      config :sentry, :dsn, nil
+    end
+  end
 end