Grafana/Prometheus/Loki stack

docker-compose.yml

version: "3.7"
services:
    prometheus:
        image: prom/prometheus
        ports:
            - 9090:9090
        volumes:
            - prometheus-storage:/prometheus

    loki:
        image: grafana/loki
        ports:
            - 3100:3100
        command: -config.file=/etc/loki/local-config.yaml

    promtail:
        image: grafana/promtail
        volumes:
            - /var/log:/var/log
        command: -config.file=/etc/promtail/docker-config.yaml

    grafana:
        image: grafana/grafana
        ports:
            - 3000:3000
        volumes:
            - grafana-storage:/var/lib/grafana
volumes:
    grafana-storage:
    prometheus-storage:

We must expose loki-storage volume too for persist data, isn't it?

    loki:
        image: grafana/loki
        ports:
            - 3100:3100
        command: -config.file=/etc/loki/local-config.yaml
        volumes:
            - loki-storage:/loki