Merge pull request #26 from flashbots/metrics

Add metrics

Author: avalonche

.env.example

@@ -1,8 +1,10 @@
 JWT_TOKEN=688f5d737bad920bdfb2fc2f488d6b6209eebda1dae949a8de91398d932c517a
+BUILDER_JWT_TOKEN=688f5d737bad920bdfb2fc2f488d6b6209eebda1dae949a8de91398d932c517a
 L2_URL=http://localhost:8551
 BUILDER_URL=http://localhost:8552
 RPC_HOST=0.0.0.0
 RPC_PORT=8081
 TRACING=false
 LOG_LEVEL=info
+METRICS=false
 BOOST_SYNC=false