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Monitoring (elk/promQL)
Elastic
Create API key 
curl -u admin:password -X POST 'https://clustername:9200/_security/api_key' -H 'Content-Type: application/json' -d '{"name": "devops-api", "expiration": "1d"}'

Generates access key for automations.
Get cluster state 
curl 'https://clustername:9200/_cluster/health?pretty'

Displays nodes, indices, health and status.
Bulk operations 
curl -X POST 'https://clustername:9200/_bulk' -H 'Content-Type: application/json' -d '
{ "index" : { "_index" : "test", "_id" : "1" } }
{ "user" : "John Doe" }
{ "delete" : { "_index" : "test", "_id" : "2" } }'

Performs multiple indexing operations.
Search match query 
curl -X GET 'https://clustername:9200/indexname/_search' -H 'Content-Type: application/json' -d '{"query": {"match": {"user": "Jane"}}}'

Returns matching documents.
Index document 
curl -X POST -H 'Content-Type: application/json' 'https://clustername:9200/maindex/_doc/1' -d '{"user":"Jane","action":"login"}'

Adds or replaces a document.
Show index mapping 
curl 'https://clustername:9200/indexname/_mapping?pretty'

Displays mapping: fields and types.
List aliases 
curl 'https://clustername:9200/_cat/aliases?pretty'

Shows aliases for routing and indexing.
List indices 
curl "https://clusterName:9200/_cat/indices?pretty"

Displays all indices.
List indices (extended) 
curl 'https://clustername:9200/_cat/indices?pretty'

Shows index size, docs count and status.
Get document by ID 
curl 'https://clustername:9200/maindex/_doc/1?pretty'

Returns full document.
Restore index 
curl -X POST 'https://clustername:9200/_snapshot/repo1/snap1/_restore' -H 'Content-Type: application/json' -d '{"indices": "maindex"}'

Restores index from snapshot.
Delete document by ID 
curl -X DELETE 'https://clustername:9200/maindex/_doc/1?pretty'

Deletes a document safely.
Use API key 
curl -H 'Authorization: ApiKey <base64-API_KEY>' 'https://clustername:9200/_cluster/health?pretty'

Authenticates using an API key.
Check cluster health 
curl "https://clusterName:9200/_cluster/health?pretty"

Shows global Elasticsearch cluster health.
Grafana
Create dashboard via API 
curl -X POST -H "Authorization: Bearer <API_KEY>" -H "Content-Type: application/json" "http://localhost:3000/api/dashboards/db" --data-binary @new_dashboard.json

Creates dashboard from JSON payload.
Create service token 
curl -X POST -H "Authorization: Bearer <API_KEY>" -H "Content-Type: application/json" '"http://localhost:3000/api/serviceaccounts/{id}/tokens" '--data '{"name":"api-token","secondsToLive":86400}'

Generates an API token valid 24h.
Create datasource 
curl -X POST -H "Authorization: Bearer <API_KEY>" -H "Content-Type: application/json" '"http://localhost:3000/api/datasources" '--data-binary @my_datasource.json

Creates a datasource (Prometheus, Loki, etc.).
Export dashboard config 
curl -H "Authorization: Bearer <API_KEY>" "http://localhost:3000/api/dashboards/uid/E3D98A6A"

Returns JSON configuration of dashboard.
List folders 
curl -H "Authorization: Bearer <API_KEY>" "http://localhost:3000/api/folders"

Returns all dashboard folders.
List organizations 
curl -H "Authorization: Bearer <API_KEY>" "http://localhost:3000/api/orgs"

Shows all organizations and IDs.
List dashboards 
curl -H "Authorization: Bearer <API_KEY>" "http://localhost:3000/api/search?type=dash-db"

Displays all dashboards.
List datasources 
curl -H "Authorization: Bearer <API_KEY>" "http://localhost:3000/api/datasources"

Shows all datasources with configuration.
List Grafana users 
curl -H "Authorization: Bearer <API_KEY>" "http://localhost:3000/api/users"

Retrieves all Grafana users via API.
Test Grafana API 
curl -H "Authorization: Bearer <API_KEY>" "http://localhost:3000/api/health"

Returns database and version info.
Prometheus
Export Spring Boot metrics 
management.endpoints.web.exposure.include=prometheus

Enables Prometheus metrics exposure.
Query CPU usage 
curl "http://localhost:9090/api/v1/query?query=node_cpu_seconds_total"

Retrieves total CPU metric per instance.
List active alerts 
curl http://localhost:9093/api/v2/alerts

Returns active alerts in JSON format.
Reload Prometheus config 
kill -HUP $(pidof prometheus)

Reloads Prometheus configuration without restart.
Check Prometheus readiness 
curl http://localhost:9090/-/ready

Returns Prometheus readiness status.
PromQL
Create simple alert 
- alert: InstanceDown
 expr: up == 0
 for: 1m

Triggers alert if instance is down for over 1 minute.
Top 5 pods CPU 
topk(5, rate(container_cpu_usage_seconds_total[5m]))

Shows highest CPU-consuming pods.
Memory usage in % 
(node_memory_MemTotal_bytes - node_memory_MemAvailable_bytes) / node_memory_MemTotal_bytes * 100

Computes memory usage percentage.
Top 5 CPU pods 
topk(5, rate(container_cpu_usage_seconds_total[5m]))

Identifies pods to investigate for optimization.