diff --git a/src/index.js b/src/index.js
index a8f31ce..3ebf3f0 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,13 +1,14 @@
 /* @flow */
 
+export * from "./apm";
 export * from "./defaults";
 export * from "./env";
 export * from "./error";
 export * from "./fpti";
 export * from "./funding";
 export * from "./locale";
+export * from "./observability";
 export * from "./order";
 export * from "./params";
 export * from "./platform";
 export * from "./types";
-export * from "./apm";
diff --git a/src/observability.js b/src/observability.js
new file mode 100644
index 0000000..18ca34e
--- /dev/null
+++ b/src/observability.js
@@ -0,0 +1 @@
+export const BASE_SDK_METRIC_NAMESPACE = "pp.sdks.ppcp.v5";