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// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
// 
//   http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
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// under the License.

using System;
using Org.Apache.REEF.Tang.Annotations;
using Org.Apache.REEF.Utilities.Attributes;

namespace Org.Apache.REEF.Common.Telemetry
{
    [Unstable("0.16", "This is to build a simple metrics with system state only. More metrics will be added in future.")]
    [DefaultImplementation(typeof(DriverMetrics))]
    public interface IDriverMetrics
    {
        /// <summary>
        /// System state
        /// </summary>
        string SystemState { get; }

        /// <summary>
        /// DateTime that the system state is updated
        /// </summary>
        DateTime TimeUpdated { get; }
    }
}