*  New: `HttpLoggingInterceptor.redactQueryParams()` configures the query parameters to redact
    in logs. For best security, don't put sensitive information in query parameters.

 *  New: `ConnectionPool.setPolicy()` configures a minimum connection pool size for a target
    address. Use this to proactively open HTTP connections.

    Connections opened to fulfill this policy are subject to the connection pool's

      * Replace `tf.keras.mixed_precision.experimental.set_policy` with `tf.keras.mixed_precision.set_global_policy`. The experimental symbol `set_policy` was renamed to `set_global_policy` in the non-experimental API.