// The limit is known as this level's BorrowingConcurrencyLimit
  // (BorrowingCL) and is a limit on the total number of seats that this
  // level may borrow at any one time.
  // This field holds the ratio of that limit to the level's nominal
  // concurrency limit. When this field is non-nil, it must hold a
  // non-negative integer and the limit is calculated as follows.
  //

  // The limit is known as this level's BorrowingConcurrencyLimit
  // (BorrowingCL) and is a limit on the total number of seats that this
  // level may borrow at any one time.
  // This field holds the ratio of that limit to the level's nominal
  // concurrency limit. When this field is non-nil, it must hold a
  // non-negative integer and the limit is calculated as follows.
  //

  // metrics contains the specifications for which to use to calculate the
  // desired replica count (the maximum replica count across all metrics will
  // be used).  The desired replica count is calculated multiplying the
  // ratio between the target value and the current value by the current
  // number of pods.  Ergo, metrics used must decrease as the pod count is
  // increased, and vice-versa.  See the individual metric source types for

  // metrics contains the specifications for which to use to calculate the
  // desired replica count (the maximum replica count across all metrics will
  // be used).  The desired replica count is calculated multiplying the
  // ratio between the target value and the current value by the current
  // number of pods.  Ergo, metrics used must decrease as the pod count is
  // increased, and vice-versa.  See the individual metric source types for

The agent also handles rotating certificates near expiration. It does so by triggering a callback from the `SecretManager` to the SDS server
when a certificate is near expiration (configurable by `SECRET_GRACE_PERIOD_RATIO`, defaulting to half of the expiration). If the SDS server
is still interested in this certificate (ie, Envoy is still connected and requesting the certificate), the SDS server will send another request

	cmd.PersistentFlags().DurationVar(&timeout, "timeout", time.Second*30,
		"The duration to wait before failing")
	cmd.PersistentFlags().Float32Var(&threshold, "threshold", 1,
		"The ratio of distribution required for success")
	cmd.PersistentFlags().StringVar(&generation, "generation", "",
		"Wait for a specific generation of config to become current, rather than using whatever is latest in "+
			"Kubernetes")

  // The limit is known as this level's BorrowingConcurrencyLimit
  // (BorrowingCL) and is a limit on the total number of seats that this
  // level may borrow at any one time.
  // This field holds the ratio of that limit to the level's nominal
  // concurrency limit. When this field is non-nil, it must hold a
  // non-negative integer and the limit is calculated as follows.
  //

  // The limit is known as this level's BorrowingConcurrencyLimit
  // (BorrowingCL) and is a limit on the total number of seats that this
  // level may borrow at any one time.
  // This field holds the ratio of that limit to the level's nominal
  // concurrency limit. When this field is non-nil, it must hold a
  // non-negative integer and the limit is calculated as follows.
  //

  // metrics contains the specifications for which to use to calculate the
  // desired replica count (the maximum replica count across all metrics will
  // be used).  The desired replica count is calculated multiplying the
  // ratio between the target value and the current value by the current
  // number of pods.  Ergo, metrics used must decrease as the pod count is
  // increased, and vice-versa.  See the individual metric source types for