private val serverWriter =
    WebSocketWriter(
      isClient = false,
      sink = data,
      random = random,
      perMessageDeflate = false,
      noContextTakeover = false,
      minimumDeflateSize = 0L,
    )
  private val clientWriter =
    WebSocketWriter(
      isClient = true,
      sink = data,
      random = random,
      perMessageDeflate = false,
      noContextTakeover = false,
      minimumDeflateSize = 0L,

The `EventListener.Factory` also makes it possible to limit metrics to a subset of calls. This one captures metrics on a random 10%:

```java
class MetricsEventListener extends EventListener {
  private static final Factory FACTORY = new Factory() {
    @Override public EventListener create(Call call) {
      if (Math.random() < 0.10) {
        return new MetricsEventListener(call);
      } else {
        return EventListener.NONE;

      this.data = debugData.toByteArray()
    }

    override fun windowUpdate(
      streamId: Int,
      windowSizeIncrement: Long,
    ) {
      check(type == -1)
      this.type = Http2.TYPE_WINDOW_UPDATE
      this.streamId = streamId
      this.windowSizeIncrement = windowSizeIncrement
    }

    override fun priority(
      streamId: Int,
      streamDependency: Int,
      weight: Int,

 *  Fix: Fail permanently when there's a failure loading the bundled public suffix database.
    This is the dataset that powers `HttpUrl.topPrivateDomain()`.

 *  Fix: Immediately update the connection's flow control window instead of waiting for the
    receiving stream to process it.

    This change may increase OkHttp's memory use for applications that make many concurrent HTTP

 * `server_max_window_bits`, and `server_no_context_takeover`.
 *
 * Typically this will look like one of the following:
 *
 * ```
 * Sec-WebSocket-Extensions: permessage-deflate
 * Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits="15"
 * Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits=15

      return if (bit and set != 0) values[HEADER_TABLE_SIZE] else -1
    }

  val initialWindowSize: Int
    get() {
      val bit = 1 shl INITIAL_WINDOW_SIZE
      return if (bit and set != 0) values[INITIAL_WINDOW_SIZE] else DEFAULT_INITIAL_WINDOW_SIZE
    }

  fun clear() {
    set = 0
    values.fill(0)
  }

  operator fun set(
    id: Int,
    value: Int,
  ): Settings {

  /**
   * Notification that the receiving stream flow control window has changed.
   * [WindowCounter] generally carries the client view of total and acked bytes.
   */
  fun receivingStreamWindowChanged(
    streamId: Int,
    windowCounter: WindowCounter,
    bufferSize: Long,
  )

  /**
   * Notification that the receiving connection flow control window has changed.

```

2. Run an Emulator using Android Studio or from command line.

```
$ emulator -no-window -no-snapshot-load @pixel5
```

2. Turn on logs with logcat

```
$ adb logcat '*:E' OkHttp:D Http2:D TestRunner:D TaskRunner:D OkHttpTest:D GnssHAL_GnssInterface:F DeviceStateChecker:F memtrack:F
...

     * Set this certificate's common name (CN). Historically this held the hostname of TLS
     * certificate, but that practice was deprecated by [RFC 2818][rfc_2818] and replaced with
     * [addSubjectAlternativeName]. If unset a random string will be used.
     *
     * [rfc_2818]: https://tools.ietf.org/html/rfc2818
     */
    fun commonName(cn: String) =
      apply {
        this.commonName = cn
      }

  }

  @Test
  @Throws(Exception::class)
  fun serverMaxWindowBitsTooLow() {
    extensionNegotiationFailure("permessage-deflate; server_max_window_bits=7")
  }

  @Test
  @Throws(Exception::class)
  fun serverMaxWindowBitsTooHigh() {
    extensionNegotiationFailure("permessage-deflate; server_max_window_bits=16")
  }

  @Test