@Nullable
  private EventLogGroup findRegisteredGroupById(@NotNull String groupId) {
    if (!myGroups.containsKey(groupId)) {
      LOG.error(
        "Cannot record event because group '" + groupId + "' is not registered. " +
        "To fix it add '<statistics.counterUsagesCollector groupId=\"" + groupId + "\" version=\"1\"/>' in plugin.xml");
      return null;
    }
    return myGroups.get(groupId);
  }
@Nullable
  private EventLogGroup findRegisteredGroupById(@NotNull String groupId)