Write block timing logs to a separate file

apps/indexer/config/dev.exs

@@ -31,6 +31,11 @@ config :logger, :empty_blocks_to_refetch,
   path: Path.absname("logs/dev/indexer/empty_blocks_to_refetch.log"),
   metadata_filter: [fetcher: :empty_blocks_to_refetch]
 
+config :logger, :block_import_timings,
+  level: :debug,
+  path: Path.absname("logs/dev/indexer/block_import_timings.log"),
+  metadata_filter: [fetcher: :block_import_timings]
+
 variant =
   if is_nil(System.get_env("ETHEREUM_JSONRPC_VARIANT")) do
     "ganache"

apps/indexer/config/prod.exs

@@ -37,6 +37,11 @@ config :logger, :empty_blocks_to_refetch,
   metadata_filter: [fetcher: :empty_blocks_to_refetch],
   rotate: %{max_bytes: 52_428_800, keep: 19}
 
+config :logger, :block_import_timings,
+  level: :debug,
+  path: Path.absname("logs/prod/indexer/block_import_timings.log"),
+  metadata_filter: [fetcher: :block_import_timings]
+
 variant =
   if is_nil(System.get_env("ETHEREUM_JSONRPC_VARIANT")) do
     "parity"

apps/indexer/lib/indexer/block/realtime/fetcher.ex

@@ -364,7 +364,9 @@ defmodule Indexer.Block.Realtime.Fetcher do
   defp log_import_timings(%{blocks: [%{number: number, timestamp: timestamp}]}, fetch_duration, time_before) do
     node_delay = Timex.diff(time_before, timestamp, :seconds)
 
-    Logger.info("Block #{number} fetching duration: #{fetch_duration / 1_000_000}s. Node delay: #{node_delay}s.")
+    Logger.debug("Block #{number} fetching duration: #{fetch_duration / 1_000_000}s. Node delay: #{node_delay}s.",
+      fetcher: :block_import_timings
+    )
   end
 
   defp log_import_timings(_inserted, _duration, _time_before), do: nil

config/config.exs

@@ -34,7 +34,8 @@ config :logger,
     {LoggerFileBackend, :reading_token_functions},
     {LoggerFileBackend, :pending_transactions_to_refetch},
     {LoggerFileBackend, :empty_blocks_to_refetch},
-    {LoggerFileBackend, :api}
+    {LoggerFileBackend, :api},
+    {LoggerFileBackend, :block_import_timings}
   ]
 
 config :logger, :console,