Environment:
- PMM Server current version: 3.4.0 (September 8, 2025)
- Target update version: 3.9.0 (July 30, 2026)
- Update method: In-UI update via “Update now” (Step 1 of 2: Update PMM Server)
- Deployment type: [Docker / OVA / AMI / Podman — fill in yours]
Issue description:
I initiated the PMM Server update from 3.4.0 to 3.9.0 via the UI. The update starts (data collection pauses as expected), but partway through it fails with a generic “Internal server error” message, with no further detail shown in the UI.
Steps to reproduce:
- On PMM Server 3.4.0, go to Home dashboard — update banner shows 3.9.0 available.
- Click Update now under “Step 1 of 2: Update PMM Server”.
- Update process begins.
- UI displays “Internal server error” and the update does not complete.
Current status:
PMM Server itself is currently running fine (still on the old/current state), but I’m unable to complete the upgrade to 3.9.0.
What I need help with:
- I tried checking
/srv/logs/pmm-update-perform.logto find the root cause, but this file doesn’t exist on my instance. - Could someone confirm the correct log location for update failures in this version, or help identify why the update fails with this generic error?
- Is this a known issue with the 3.4.0 → 3.9.0 upgrade path specifically?
Any guidance on which logs to check or how to retry the update safely would be appreciated.
Before and even after upgrade attempt PMM is running fine:
