Log timestamp in openobserve is wrong

[ondravondra]

Because this library sends the real timestamp as "_t", it is ignored by openobserve and instead time of reception is set as the "_timestamp" field.
The "_timestamp" should be set on the client side, openobserve will then use its value as documented at https://openobserve.ai/docs/user-guide/concepts/#timestamp

[nixxcz]

I have just run into the same problem and came to the same conclusion