Where to go in Kibana to see Span details for APM?

Elastic Observability APM
4

The reason for this issue might be the fact that the transaction is begun but not ended.
There is actually no need to start a transaction since there's always a default transaction that is automatically started (Public API | APM PHP Agent Reference [1.x] | Elastic) and ended by Elastic APM PHP agent itself.
So one way to fix it:

<?php

use Elastic\Apm\ElasticApm;

$transaction = ElasticApm::getCurrentTransaction();

$span = $transaction->beginCurrentSpan(
    'spangled_banner',
    'span_type',
    'span_sub-type', // optional
    'span_action' // optional
);
try {
    // do your thing ...
    echo 'start sleep';
    sleep(3);
    echo 'done sleeping';
} finally {
    $span->end();
}
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