message: cluster manager: add more debug logging
  Debugging issues like the one in are really hard without being
  able to see what's going on in the CM.
diff: @@ -119,18 +119,23 @@ void ClusterManagerInitHelper::initializeSecondaryClusters() {
  void ClusterManagerInitHelper::maybeFinishInitialize() {
  // Do not do anything if we are still doing the initial static load or if we are waiting for
  // CDS initialize.
  + ENVOY_LOG(debug, "maybe finish initialize state: {}", enumToInt(state_));
  if (state_ == State::Loading || state_ == State::WaitingForCdsInitialize) {
  return;
  }
  // If we are still waiting for primary clusters to initialize, do nothing.
  ASSERT(state_ == State::WaitingForStaticInitialize || state_ == State::CdsInitialized);
  + ENVOY_LOG(debug, "maybe finish initialize primary init clusters empty: {}",
  + primary_init_clusters_.empty());
  if (!primary_init_clusters_.empty()) {
  return;
  }
  // If we are still waiting for secondary clusters to initialize, see if we need to first call
  // initialize on them. This is only done once.
  + ENVOY_LOG(debug, "maybe finish initialize secondary init clusters empty: {}",
  + secondary_init_clusters_.empty());
  if (!secondary_init_clusters_.empty()) {
  if (!started_secondary_initialize_) {
  ENVOY_LOG(info, "cm init: initializing secondary clusters");
  @@ -153,6 +158,7 @@ void ClusterManagerInitHelper::maybeFinishInitialize() {
  // At this point, if we are doing static init, and we have CDS, start CDS init. Otherwise, move
  // directly to initialized.
  started_secondary_initialize_ = false;
  + ENVOY_LOG(debug, "maybe finish initialize cds api ready: {}", cds_ != nullptr);
  if (state_ == State::WaitingForStaticInitialize && cds_) {
  ENVOY_LOG(info, "cm init: initializing cds");
  state_ = State::WaitingForCdsInitialize;
  