message: Fully qualify calls to the statPrefixJoin() function. Otherwise build fails when the stats macros are used outside of the Envoy namespace.
diff: @@ -55,9 +55,9 @@ static inline std::string statPrefixJoin(absl::string_view prefix, absl::string_
  return absl::StrCat(prefix, ".", token);
  }
  -#define POOL_COUNTER_PREFIX(POOL, PREFIX) (POOL).counter(statPrefixJoin(PREFIX, FINISH_STAT_DECL_
  -#define POOL_GAUGE_PREFIX(POOL, PREFIX) (POOL).gauge(statPrefixJoin(PREFIX, FINISH_STAT_DECL_MODE_
  -#define POOL_HISTOGRAM_PREFIX(POOL, PREFIX) (POOL).histogram(statPrefixJoin(PREFIX, FINISH_STAT_DECL_
  +#define POOL_COUNTER_PREFIX(POOL, PREFIX) (POOL).counter(Envoy::statPrefixJoin(PREFIX, FINISH_STAT_DECL_
  +#define POOL_GAUGE_PREFIX(POOL, PREFIX) (POOL).gauge(Envoy::statPrefixJoin(PREFIX, FINISH_STAT_DECL_MODE_
  +#define POOL_HISTOGRAM_PREFIX(POOL, PREFIX) (POOL).histogram(Envoy::statPrefixJoin(PREFIX, FINISH_STAT_DECL_
  #define POOL_COUNTER(POOL) POOL_COUNTER_PREFIX(POOL, "")
  #define POOL_GAUGE(POOL) POOL_GAUGE_PREFIX(POOL, "")
  