* kubelet: send all recevied pods in one update ([#23141](https://github.com/kubernetes/kubernetes/pull/23141), [@yujuhong](https://github.com/yujuhong))
* Add a SSHKey sync check to the master's healthz (when using SSHTunnels). ([#23167](https://github.com/kubernetes/kubernetes/pull/23167), [@cjcullen](https://github.com/cjcullen))

            activeConnections.decrementAndGet();
        }

        public boolean isHealthy() {
            return isHealthy;
        }

        public void setHealthy(boolean healthy) {
            this.isHealthy = healthy;
            this.lastHealthCheck = System.currentTimeMillis();
        }

        public long getLastHealthCheck() {
            return lastHealthCheck;
        }

        @Override

    }

    /**
     * Set the health check interval
     * @param millis the health check interval in milliseconds
     */
    public void setHealthCheckInterval(int millis) {
        if (millis <= 0) {
            throw new IllegalArgumentException("Health check interval must be positive");
        }
        this.healthCheckInterval = millis;
        log.info("Set health check interval to {} ms", millis);
    }

  /**
   * Waits for the {@link ServiceManager} to become {@linkplain #isHealthy() healthy}. The manager
   * will become healthy after all the component services have reached the {@linkplain State#RUNNING
   * running} state.
   *
   * @throws IllegalStateException if the service manager reaches a state from which it cannot
   *     become {@linkplain #isHealthy() healthy}.
   */
  public void awaitHealthy() {
    state.awaitHealthy();
  }

  /**
   * Waits for the {@link ServiceManager} to become {@linkplain #isHealthy() healthy}. The manager
   * will become healthy after all the component services have reached the {@linkplain State#RUNNING
   * running} state.
   *
   * @throws IllegalStateException if the service manager reaches a state from which it cannot
   *     become {@linkplain #isHealthy() healthy}.
   */
  public void awaitHealthy() {
    state.awaitHealthy();
  }

     *
     * @return collection of all channels
     */
    public Collection<ChannelInfo> getChannels() {
        return channels.values();
    }

    /**
     * Get healthy channels only
     *
     * @return collection of healthy channels
     */
    public Collection<ChannelInfo> getHealthyChannels() {
        return channels.values()
                .stream()
                .filter(ChannelInfo::isHealthy)

        Collection<ChannelInfo> availableChannels = manager.getHealthyChannels();
        
        if (availableChannels.isEmpty()) {
            throw new NoAvailableChannelException("No healthy channels available");
        }
        
        if (availableChannels.size() == 1) {
            return availableChannels.iterator().next();
        }
        
        switch (strategy) {

     */
    public long getIdleTime() {
        return System.currentTimeMillis() - lastActivityTime;
    }

    /**
     * Check if channel is in healthy state
     *
     * @return true if healthy
     */
    public boolean isHealthy() {
        return state == ChannelState.ACTIVE || state == ChannelState.ESTABLISHED;
    }

    /**
     * Get channel binding hash
     *

    }
  }

  private fun makeSimpleCall() {
    server.enqueue(MockResponse(body = "healthy"))
    val callB = client.newCall(Request(server.url("/")))
    callB.execute().use { response ->
      assertThat(response.body.string()).isEqualTo("healthy")
    }
  }

  private fun enableProtocol(protocol: Protocol) {
    enableTls()
    client =
      client

    // Make sure this connection is healthy & eligible for new exchanges. If it's no longer needed
    // then we're on the hook to close it.
    val healthy = candidate.isHealthy(doExtensiveHealthChecks)
    var noNewExchangesEvent = false
    val toClose: Socket? =
      candidate.withLock {
        when {
          !healthy -> {
            noNewExchangesEvent = !candidate.noNewExchanges