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Metrics Exporters

Prometheus exporters for system and service metrics.

Overview​

Exporters expose metrics in Prometheus format for scraping.

Node Exporter​

Host system metrics (CPU, memory, disk, network).

PropertyValue
Imageprom/node-exporter:latest
Containernode-exporter
Port9100

Key Metrics​

# CPU usage
100 - (avg(rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100)

# Memory usage
(1 - node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes) * 100

# Disk usage
(1 - node_filesystem_avail_bytes / node_filesystem_size_bytes) * 100

cAdvisor​

Container metrics (CPU, memory, network per container).

PropertyValue
Imagegcr.io/cadvisor/cadvisor:latest
Containercadvisor
Port8080

Key Metrics​

# Container CPU
rate(container_cpu_usage_seconds_total{name!=""}[5m])

# Container memory
container_memory_usage_bytes{name!=""}

# Container restarts
changes(container_start_time_seconds{name!=""}[1h])

PostgreSQL Exporter​

Database performance metrics.

PropertyValue
Imageprometheuscommunity/postgres-exporter:latest
Containerpostgres-exporter
Port9187

Key Metrics​

# Active connections
pg_stat_activity_count

# Database size
pg_database_size_bytes

# Slow queries
pg_stat_statements_seconds_total

Redis Exporter​

Cache performance metrics.

PropertyValue
Imageoliver006/docs/infrastructure/redis_exporter:latest
Containerredis-exporter
Port9121

Key Metrics​

# Connected clients
redis_connected_clients

# Memory usage
redis_memory_used_bytes

# Cache hit rate
redis_keyspace_hits_total / (redis_keyspace_hits_total + redis_keyspace_misses_total)

Quick Commands​

# Test exporter endpoints
curl http://localhost:9100/metrics | head -20  # node-exporter
curl http://localhost:8080/metrics | head -20  # cadvisor
curl http://localhost:9187/metrics | head -20  # postgres-exporter
curl http://localhost:9121/metrics | head -20  # redis-exporter