Add kind and top level message to DataDog formatter

Author: AndrewDryga

lib/logger_json/formatters/datadog.ex

@@ -116,24 +116,42 @@ defmodule LoggerJSON.Formatters.Datadog do
   end
 
   @doc false
-  def format_crash_reason(binary, {%{} = _exception, stacktrace}, _meta) do
+  def format_crash_reason(binary, {%struct{} = _exception, stacktrace}, _meta) do
+    kind =
+      struct
+      |> Module.split()
+      |> List.last()
+
+    message = IO.chardata_to_string(binary)
+
     %{
+      message: message,
       error: %{
-        message: IO.chardata_to_string(binary),
+        kind: kind,
+        message: message,
         stack: Exception.format_stacktrace(stacktrace)
       }
     }
   end
 
   # https://docs.datadoghq.com/standard-attributes/?search=logger+error&product=log+management
-  def format_crash_reason(binary, _other, _meta) do
+  def format_crash_reason(binary, other, _meta) do
+    message = IO.chardata_to_string(binary)
+
     %{
+      message: message,
       error: %{
-        message: IO.chardata_to_string(binary)
+        kind: format_crash_reason_kind(other),
+        message: message
       }
     }
   end
 
+  defp format_crash_reason_kind({{:EXIT, _pid}, _reason}), do: "exit"
+  defp format_crash_reason_kind({:exit, _reason}), do: "exit"
+  defp format_crash_reason_kind({:throw, _reason}), do: "throw"
+  defp format_crash_reason_kind(_), do: "other"
+
   defp syslog(level, meta, :system) do
     {:ok, hostname} = :inet.gethostname()
 

test/logger_json/formatters/datadog_test.exs

@@ -284,7 +284,9 @@ defmodule LoggerJSON.Formatters.DatadogTest do
       |> decode_or_print_error()
 
     assert %{
+             "message" => message,
              "error" => %{
+               "kind" => "RuntimeError",
                "message" => message,
                "stack" => stacktrace
              },
@@ -354,7 +356,7 @@ defmodule LoggerJSON.Formatters.DatadogTest do
       end)
       |> decode_or_print_error()
 
-    assert log["error"] == %{"message" => "Hello"}
+    assert log["error"] == %{"message" => "Hello", "kind" => "exit"}
 
     assert log["network"] == %{"client" => %{"ip" => "127.0.0.1"}}