Created a CustomLogfmtEx to aprse root and bits metadate and be able …

…to adde the root to the logs

config/runtime.exs

@@ -241,9 +241,9 @@ case Keyword.get(args, :log_file) do
     config :logger, utc_log: true
 
     config :logger, :default_formatter,
-      format: {LogfmtEx, :format},
+      format: {CustomLogfmtEx, :format},
       colors: [enabled: false],
-      metadata: [:mfa, :pid, :slot]
+      metadata: [:mfa, :pid, :slot, :root]
 
     config :logfmt_ex, :opts,
       message_key: "msg",

lib/lambda_ethereum_consensus/logger/custom_logfmt_ex.ex

@@ -0,0 +1,19 @@
+defmodule CustomLogfmtEx do
+  @moduledoc """
+  Custom logger formatter for logfmt output.
+  """
+
+  alias LambdaEthereumConsensus.Utils
+
+  def format(level, message, timestamp, metadata) do
+    formatted_metadata = format_metadata(metadata)
+
+    LogfmtEx.format(level, message, timestamp, formatted_metadata)
+  end
+
+  defp format_metadata(metadata) do
+    metadata
+    |> Keyword.replace_lazy(:root, &Utils.format_shorten_binary(&1))
+    |> Keyword.replace_lazy(:bits, &Utils.format_bitstring(&1))
+  end
+end

metrics/promtail/promtail.yml

@@ -26,6 +26,7 @@ scrape_configs:
             process: registered_name
             pid:
             slot:
+            root:
       - timestamp:
           format: "2006-01-02T15:04:05.000"
           source: ts
@@ -35,5 +36,6 @@ scrape_configs:
           process:
           pid:
           slot:
+          root:
       - output:
           source: msg