[Question] /prometheus endpoint throwing 500 error

[wslyngstad]

Welcome!

• I have read the documentation and my problem was not listed in the help section.
• I have searched open and closed issues and my problem was not mentioned before.
• I have verified I am using the latest version available. You can check the latest release here.
• I agree to follow this project's Code of Conduct.

What did you do?

Updated to latest version, 1.13.8, and noticed I had one data source not working on my Prometheus widget. When I attempt to navigate to /prometheus I get "500 Oops, server error!" I have no restrictions on IPs and it was working until very recently. Noticed last test had no % packet loss reported, but was marked as completed . If I run another test and that one has packet loss % reported, I do not receive the 500 server error.

Expected Behavior

Prometheus should be able to scrape data from http://speedtestIP/prometheus to collect historical data.

Steps to Reproduce

1. Open Speedtest URL
2. Run a speedtest
3. If completed and all fields have data go to 4. If field missing data but completed, go to 5.
4. Navigate to http:/speedtestIP:port/prometheus to review if data present.
5. Navigate to http:/speedtestIP:port/prometheus and receive 500 Server error

Deployment Environment

Docker Compose

What is your environment & configuration?

services:
  speedtest:
    image: ghcr.io/linuxserver/speedtest-tracker:latest
    container_name: speedtest
    environment:
      - PGUID=1000
      - PGID=1000
      - TZ=America/Chicago
      - APP_TIMEZONE=America/Chicago
      - DISPLAY_TIMEZONE=America/Chicago
      - APP_KEY=REMOVED
      - SPEEDTEST_SCHEDULE=0 */4 * * *
      - SPEEDTEST_SERVERS=68860,64168,56437,7306,56441,56435,34181
      - SPEEDTEST_BLOCKED_SERVERS=20875,5342
    ports:
      - 8082:80
    volumes:
      - /home/speedtest/config:/config
      - /etc/localtime:/etc/localtime:ro
    restart: unless-stopped

Add more configuration information here.

Application Information

N/A

What browser(s) are you seeing the problem on?

Safari

Logs

[migrations] started
[migrations] 01-nginx-site-confs-default: skipped
[migrations] done
usermod: no changes
───────────────────────────────────────

      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝

   Brought to you by linuxserver.io
───────────────────────────────────────

To support the app dev(s) visit:
speedtest-tracker: https://github.com/sponsors/alexjustesen

To support LSIO projects visit:
https://www.linuxserver.io/donate/

───────────────────────────────────────
GID/UID
───────────────────────────────────────

User UID:    911
User GID:    1000
───────────────────────────────────────
Linuxserver.io version: v1.13.8-ls135
Build-date: 2026-02-04T19:32:27+00:00
───────────────────────────────────────
    
using keys found in /config/keys
**** The following active confs have different version dates than the samples that are shipped. ****
**** This may be due to user customization or an update to the samples. ****
**** You should compare the following files to the samples in the same folder and update them. ****
**** Use the link at the top of the file to view the changelog. ****
┌────────────┬────────────┬────────────────────────────────────────────────────────────────────────┐
│  old date  │  new date  │ path                                                                   │
├────────────┼────────────┼────────────────────────────────────────────────────────────────────────┤
│ 2024-05-27 │ 2025-05-31 │ /config/nginx/nginx.conf                                               │
│ 2023-08-13 │ 2025-07-18 │ /config/nginx/ssl.conf                                                 │
│ 2024-05-28 │ 2025-11-10 │ /config/nginx/site-confs/default.conf                                  │
└────────────┴────────────┴────────────────────────────────────────────────────────────────────────┘
[custom-init] No custom files found, skipping...
[ls.io-init] done.
[2026-02-04 14:00:48] production.DEBUG: Pinged hostname {"host":"icanhazip.com","data":{"success":true,"error":null,"host":"icanhazip.com","packet_loss_percentage":0,"packets_transmitted":1,"packets_received":1,"options":{"timeout_in_seconds":5,"interval":1.0,"packet_size_in_bytes":56,"ttl":64,"ip_version":"ipv4"},"timings":{"minimum_time_in_ms":20.953,"maximum_time_in_ms":20.953,"average_time_in_ms":20.953,"standard_deviation_time_in_ms":0.0}}}