Hi team,

I’m using Fluent Bit as an embedded library inside a C# application.
I’m pushing event data directly using flb_lib_push(), but I’m seeing frequent log messages saying

[2025/10/29 10:49:48] [ warn] [input:lib:lib.0] lib data invalid

For the first 5 minutes(this is random sometime can be 1 hour), everything runs normally and all records are ingested successfully.
After that, the errors start appearing. There are no exceptions on the C# side — everything seems to push normally.

`
public static void PushData(int inputId, IEvent data)
{
try
{
long unixTime = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
string jsonMap = JsonConvert.SerializeObject(data);

    var metadata = new Dictionary<string, dynamic>
    {
        { "ObservedTimestamp", data.ObservedTime },
        { "Timestamp", data.Time },
        { "TraceId", data.TraceId },
        { "SpanId", data.SpanId }
    };

    var serializedMetaData = JsonConvert.SerializeObject(metadata);

    string payload = $"[[{unixTime}, {serializedMetaData}], {jsonMap}]";

    var bytes = Encoding.UTF8.GetBytes(payload);
    FluentBitPInvoke.flb_lib_push(_ctx, inputId, bytes, bytes.Length);
}
catch (Exception ex)
{
    Globals.Logger.Error($"[FB PushData] {ex.Message}");
}

}
`

Observed behavior:

• Some records go through successfully.
• Others fail and cause Fluent Bit to print [lib] data invalid.
• This happens randomly

Expected behavior
All events should be accepted and processed without showing lib data invalid.