[BUG] OpenSearch Dashboard - 2.18.0 | Prometheus Data Source cannot be added

[bugravibes]

Describe the bug

I've recently upgraded my cluster to 2.18.0 from 2.12.0, since older version has a bug on metric visualizing. But now I can't even add my Prometheus to the OpenSearch Dashboards (I can add Prometheus Data Source via API but not visible to UI)

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Dashboards Management -> Data Sources -> Create Data Source'
2. Fill in the blanks
3. Click on 'Connect to Prometheus'
4. See error

OpenSearch Version
OpenSearch 2.18.0

Dashboards Version
Opensearch Dashboards 2.18.0

Plugins
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Screenshots

Host/Environment (please complete the following information):

• OS: RHEL 8.10
• Browser and version : Chrome Version 131.0.6778.265

Additional context
Relevant Log:
Jan 19 03:12:21 mysw01 opensearch-dashboards[2198234]: {"type":"response","@timestamp":"2025-01-19T00:12:21Z","tags":[],"pid":2198234,"method":"post","statusCode":404,"req":{"url":"/api/directquery/dataconnections","method":"post","headers":{"host":"MyIP:5601","connection":"keep-alive","content-length":"230","osd-version":"2.18.0","user-agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.0","content-type":"application/json","osd-xsrf":"osd-fetch","accept":"*/*","origin":"http://MyIP:5601","referer":"http://MyIP:5601/app/management/opensearch-dashboards/dataSources/configure/Prometheus","accept-encoding":"gzip, deflate","accept-language":"en-US,en;q=0.9"},"remoteAddress":"PrometheusIP","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.0","referer":"http://MyIP:5601/app/management/opensearch-dashboards/dataSources/configure/Prometheus"},"res":{"statusCode":404,"responseTime":1,"contentLength":9},"message":"POST /api/directquery/dataconnections 404 1ms - 9.0B"}