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A simple uptime monitor for Prometheus
  • Rust 100%
2026年04月18日 02:13:15 +02:00
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up_metrics

A simple uptime monitor and stats collector for prometheus.

Why?

FreshRSS and Plausible don't have metrics but I want to have an up value and some stats for them.

Configuration & Usage

Here is an example config. Place it at ~/apps/up_metrics:

[[endpoints]]
name = "freshrss"
type = "freshrss"
host = "freshrss.jak2k.eu"
user = "jak2k"
token = "..." # From curl 'https://freshrss.example.net/api/greader.php/accounts/ClientLogin?Email={{user}}&Passwd={{app_password}}'
[[endpoints]]
name = "website"
type = "http_get"
url = "https://jak2k.eu/"
[[endpoints]]
name = "plausible"
type = "http_get"
url = "https://plausible.jak2k.eu/"
[[endpoints]]
name = "linkding"
type = "linkding"
host = "linkding.jak2k.eu"
token = "..."

Build the binary and place it at ~/apps/up_metrics/up_metrics. Then create this file at ~/.config/systemd/user/up-metrics.service:

[Unit]
Description=Up Metrics Health Check Exporter
After=network-online.target
Wants=network-online.target
[Service]
Type=simple
ExecStart=%h/apps/up_metrics/up_metrics %h/apps/up_metrics/config.toml
Restart=always
RestartSec=10
WorkingDirectory=%h/apps/up_metrics
# Security settings
NoNewPrivileges=true
ProtectSystem=strict
ProtectHome=read-only
ReadWritePaths=%h/apps/up_metrics
PrivateTmp=true
ProtectKernelTunables=true
ProtectKernelModules=true
ProtectControlGroups=true
# Resource limits
LimitNOFILE=65536
LimitNPROC=4096
# Logging
StandardOutput=journal
StandardError=journal
SyslogIdentifier=up-metrics
[Install]
WantedBy=default.target

Now run systemctl --user daemon-reload and systemctl --user enable --now up-metrics and add https://localhost:9095 to your Prometheus config. Don't forget to make your user linger: sudo loginctl enable-linger $USER.

Queries you can use in Grafana

  • linkding_bookmarks{app_type="linkding"}
  • freshrss_feeds{app="freshrss"}
  • freshrss_posts_unread{app="freshrss"}
  • This one only works after two hours of collecting data: 
    avg_over_time(
 clamp_min(
 (freshrss_posts_unread{app_type="freshrss"} offset 1h)
 - 
 freshrss_posts_unread{app_type="freshrss"},
 0
 )[1h:1h]
)
  • sum by(app) (up{app=~".+"})