prometheus-net

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using System.Diagnostics;
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namespace Prometheus;
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/// <summary>
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/// Describes a lifetime of a lifetime-managed metric instance.
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/// </summary>
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/// <remarks>
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/// Contents modified via atomic operations, not guarded by locks.
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/// </remarks>
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internal sealed class ChildLifetimeInfo
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{
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    /// <summary>
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    /// Number of active leases. Nonzero value here indicates the lifetime extends forever.
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    /// </summary>
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    public int LeaseCount;
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    /// <summary>
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    /// When the last lifetime related activity was performed. Expiration timer starts counting from here.
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    /// This is refreshed whenever a lease is released (a kept lease is a forever-keepalive, so we only care about releasing).
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    /// </summary>
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    public long KeepaliveTimestamp;
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    /// <summary>
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    /// The lifetime has been ended, potentially while a lease was active. The next time a lease ends,
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    /// it will have to re-register the lifetime instead of just extending the existing one.
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    /// </summary>
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    public bool Ended;
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    public override string ToString()
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    {
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        var leaseCount = Volatile.Read(ref LeaseCount);
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        var keepaliveTimestamp = Volatile.Read(ref KeepaliveTimestamp);
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        var ended = Volatile.Read(ref Ended);
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        var age = PlatformCompatibilityHelpers.StopwatchGetElapsedTime(keepaliveTimestamp, Stopwatch.GetTimestamp());
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        return $"LeaseCount: {leaseCount}, KeepaliveTimestamp: {keepaliveTimestamp}, Ended: {ended}, Age: {age.TotalSeconds:F3} seconds";
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    }
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}