add more text

WORKSPACE

@@ -83,7 +83,7 @@ go_rules_dependencies()
 
 go_register_toolchains(go_version = GO_VERSION)
 
-# TODO(bianpengyuan): remove this googleapis dep when upstream imports it in
+# TODO(bianpengyuan): remove this googleapis dep when upstream envoy-wasm repo merges
 # https://github.com/envoyproxy/envoy/pull/5387
 load("//extensions/stackdriver/opencensus:opencensus.bzl", "telemetry_googleapis")
 

extensions/stackdriver/opencensus/README.md

@@ -3,7 +3,7 @@
 This folder includes opencensus library copied from <https://github.com/census-instrumentation/opencensus-cpp> with customization. Even though opencensus-cpp repo has already had bazel setup, the original code won't work out of box within a wasm sandbox or in an envoy worker silo, so we have to copy and customize it. Customization includes:
 
 * Remove threading and thread annotations due to silo thread contrain.
-* Remove assertion since it is not yet well supported by WASM runtime ABI.
+* Remove assertion and stdio since they are not yet well supported by WASM VM ABI. All assertions are about checking misuse of opencensus library. It should not be a concern here since the library is used in a certain way.
 * Customized stackdriver exporter using WASM sandbox gRPC API.
 
 The library is mainly used to do data aggregation for some predefined metrics and export them to Stackdriver. The code in this directory should mostly remain unchanged unless bug is found.