*   Make the Bigtable client connection pool configurable & increase the
    default # of connections for performance.
*   Added derivative of `tf.random_gamma` with respect to the alpha parameter.
*   Added derivative of `tf.igamma(a, x)` and `tf.igammac(a, x)` with respect to
    a.
*   Modified Bessel functions of order zero and one.
*   Add FillTriangular Bijector to create triangular matrices.

    - `apiserver_flowcontrol_demand_seats_average`: Time-weighted average, over last adjustment period, of demand_seats
    - `apiserver_flowcontrol_demand_seats_stdev`: Time-weighted standard deviation, over last adjustment period, of demand_seats
    - `apiserver_flowcontrol_demand_seats_smoothed`: Smoothed seat demands
    - `apiserver_flowcontrol_target_seats`: Seat allocation targets