Upgrade dd-trace, add APM tracing around key commands, fix tags should be attached to root spans (#3243)

server/logging/tracing.ts

@@ -0,0 +1,20 @@
+import { init, tracer } from "@theo.gravity/datadog-apm";
+
+export * as APM from "@theo.gravity/datadog-apm";
+
+// 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) {
+  init(
+    {
+      // SOURCE_COMMIT is used by Docker Hub
+      // SOURCE_VERSION is used by Heroku
+      version: process.env.SOURCE_COMMIT || process.env.SOURCE_VERSION,
+    },
+    {
+      useMock: process.env.NODE_ENV === "test",
+    }
+  );
+}
+
+export default tracer;