Http stats and stats per route extractor

HttpClientStatsExtractor.java

public Runnable connectionPoolMetricsLogger(final PoolingHttpClientConnectionManager connectionManager) {
  return new Runnable() {
    @Override
    @Scheduled(fixedDelay = 30000)
    public void run() {
      final StringBuilder buffer = new StringBuilder();
      try {
        if (connectionManager != null) {
          final PoolStats totalPoolStats = connectionManager.getTotalStats();
          log.info(" ** HTTP Client Connection Pool Stats : Available = {}, Leased = {}, Pending = {}, Max = {} **",
              totalPoolStats.getAvailable(), totalPoolStats.getLeased(), totalPoolStats.getPending(), totalPoolStats.getMax());
          connectionManager
            .getRoutes()
            .stream()
            .forEach(route -> {
              final PoolStats routeStats = connectionManager.getStats(route);
              buffer
                .append(" ++ HTTP Client Connection Pool Route Pool Stats ++ ")
                .append(" Route : " + route.toString())
                .append(" Available : " + routeStats.getAvailable())
                .append(" Leased : " + routeStats.getLeased())
                .append(" Pending : " + routeStats.getPending())
                .append(" Max : " + routeStats.getMax());
            });
          log.info(buffer.toString());
        }
      } catch (Exception e) {
        log.error("Exception occurred whilst logging http connection pool stats. msg = {}, e = {}", e.getMessage(), e);
      }
    }
  };
}