static const char NOT_FOUND[] = "Resource Not Found";
static const char RESOURCE_ERROR[] = "Resource Error";
static const char SLOW_RESOURCE[] = "Slow Resource";
+ static const char DUPLICATE_REQUEST[] = "Duplicate Request";
static const char NO_OBSERVERS[] = "No Observers";
static const char OBSV_NO_FOUND[] = "Stack observer not found";
static const char OBSV_NOT_ADDED[] = "Stack observer not added";