Infrastructure monitoring with Grafana + Prometheus + Zabbix

Monitoring is for real understanding of infrastructure — capacity planning, trend analysis, debugging.

Monitoring stratification

• Infrastructure (Prometheus, Zabbix)
• Network (SNMP, NetFlow)
• Application (latency P50/P95/P99)
• Business metrics
• Centralized logs
• Distributed tracing (Jaeger)

What we deliver

Complete Prometheus + Grafana + Zabbix + Loki stack, dashboards per audience, alerting with severity calibration.

Example: Prometheus scrape

A scrape config for node_exporter and a disk alert:

# prometheus.yml — scrape node_exporter
scrape_configs:
  - job_name: 'nodes'
    static_configs:
      - targets: ['10.0.0.11:9100','10.0.0.12:9100']
# alerta simpla (rules.yml): disk > 85%
#   expr: 100-(node_filesystem_avail_bytes/node_filesystem_size_bytes*100) > 85

node_exporter + Prometheus scrape

You install the exporter on hosts and add it to Prometheus:

# pe fiecare host
apt -y install prometheus-node-exporter
# prometheus.yml
scrape_configs:
  - job_name: nodes
    static_configs:
      - targets: ['10.0.0.11:9100','10.0.0.12:9100']
promtool check config /etc/prometheus/prometheus.yml

Alerting rules

A rule that alerts when the disk is nearly full:

# rules.yml
groups:
- name: disk
  rules:
  - alert: DiskAproapePlin
    expr: 100 - (node_filesystem_avail_bytes/node_filesystem_size_bytes*100) > 85
    for: 10m
    labels: { severity: warning }
    annotations: { summary: 'Disk > 85% pe {{ $labels.instance }}' }

Grafana as code (provisioning)

Datasources and dashboards versioned, not clicked by hand:

# /etc/grafana/provisioning/datasources/prom.yml
apiVersion: 1
datasources:
  - name: Prometheus
    type: prometheus
    url: http://localhost:9090
    isDefault: true
# dashboards din fisiere JSON in git:
# /etc/grafana/provisioning/dashboards/ -> path catre .json
systemctl restart grafana-server

Centralized logs: Loki + promtail

You ship logs to Loki and query them in Grafana:

# promtail (agent pe host) - scrape_configs
scrape_configs:
  - job_name: system
    static_configs:
      - targets: [localhost]
        labels: { job: varlogs, __path__: /var/log/*.log }
# in Grafana (Explore):  {job="varlogs"} |= "error"