[BUG] Not all spans are displayed in gantt chart

[joshuali925]

What is the bug?
Currently gantt chart limits the maximum number of spans to 3k for performance. The list of spans come from this query sorted by startTime in descending order.

dashboards-observability/public/components/trace_analytics/requests/queries/traces_queries.ts

Line 350 in 47e8578

order: 'desc',

If a trace has more than 3k spans, the gantt chart only shows the latest 3k spans

How can one reproduce the bug?
Steps to reproduce the behavior:

1. Create a trace with more than 3k spans
2. Go to the trace
3. See gantt chart, only the latest 3k spans are displayed

What is the expected behavior?
Should show all spans

What is your host/environment?

• OS: [e.g. iOS]
• Version [e.g. 22]
• Plugins

Do you have any screenshots?
If applicable, add screenshots to help explain your problem.

Do you have any additional context?
Add any other context about the problem.

[dblock]

[Catch All Triage - 1, 2]