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The default retention of Prometheus on SwarmTelemetry is 15 days, so data will be removed automatically after 15 days. Below is how to change the data retention of Prometheus.

  1. Edit the prometheus.service file

    vi /etc/systemd/system/prometheus.service
  2. Change the value of “--storage.tsdb.retention.time=15d" below to "ExecStart=/usr/local/bin/prometheus \" line.
    The config will look like below for 45 days of data retention. (e.g. 1 year: 1y or 365d)

    # /etc/systemd/system/prometheus.service
    [Unit]
    Description=Prometheus Server
    Documentation=https://prometheus.io/docs/introduction/overview/
    After=network-online.target
    
    [Service]
    User=prometheus
    Restart=on-failure
    ExecStart=/usr/local/bin/prometheus \
                                    --config.file=/etc/prometheus/prometheus.yml \
                                    --storage.tsdb.path=/var/lib/prometheus/data \
                                    --storage.tsdb.retention.time=45d \
                                    --web.console.templates=/etc/prometheus/consoles \
                                    --web.console.libraries=/etc/prometheus/console_libraries
    
    [Install]
    WantedBy=multi-user.target
  3. Reload systemd manager configuration

    systemctl daemon-reload
  4. Restart Prometheus service

    systemctl restart prometheus

See the Prometheus documentation.

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