chore: Add optional DD tracer

server/index.js

@@ -1,6 +1,12 @@
 // @flow
 require("dotenv").config({ silent: true });
 
+// If the DataDog agent is installed and the DD_API_KEY environment variable is
+// in the environment then we can safely attempt to start the DD tracer
+if (process.env.DD_API_KEY) {
+  require("dd-trace").init();
+}
+
 if (
   !process.env.SECRET_KEY ||
   process.env.SECRET_KEY === "generate_a_new_key"