o = msgp.AppendDuration(o, z.cacheInterval)
	// string "metricsGroupOpts"
	o = append(o, 0xb0, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x47, 0x72, 0x6f, 0x75, 0x70, 0x4f, 0x70, 0x74, 0x73)
	o, err = z.metricsGroupOpts.MarshalMsg(o)
	if err != nil {
		err = msgp.WrapError(err, "metricsGroupOpts")
		return
	}
	return
}

// UnmarshalMsg implements msgp.Unmarshaler