feat: integrate observability into main eoapi chart

- Remove separate eoapi-support chart and integrate all observability features into main chart
- Add optional monitoring dependencies: metrics-server, prometheus, prometheus-adapter, grafana
- Add monitoring helper templates (_monitoring.yaml, _resources.yaml, observability.yaml)
- Add comprehensive observability documentation with deployment examples
- Add reusable monitoring configuration base (values/monitoring.yaml)
- Add autoscaling test suite for HPA validation
- Move Grafana dashboard from eoapi-support to main chart
- Update main values.yaml with observability configuration options

This consolidation simplifies deployment by eliminating the need for a separate observability chart while maintaining full flexibility for enabling monitoring features.

Author: pantierra

CHANGELOG.md

@@ -34,7 +34,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
-- Excluded renovate.json from CHANGELOG.md edits [#301](https://github.com/developmentseed/eoapi-k8s/pull/301)
+- Refactores eoapi-support into core eoapi chart [#262](https://github.com/developmentseed/eoapi-k8s/pull/262)
+
 
 ## [0.7.8] - 2025-09-10
 

charts/eoapi-support/.gitignore

@@ -57,3 +57,27 @@ dependencies:
     version: 0.0.7
     repository: "oci://ghcr.io/developmentseed/charts"
     condition: eoapi-notifier.enabled
+
+  # Optional monitoring components for metrics collection and autoscaling
+  # These are disabled by default to keep deployments lightweight
+  # Enable via: monitoring.prometheus.enabled=true, monitoring.metricsServer.enabled=true
+  - name: metrics-server
+    version: 7.2.8
+    repository: https://charts.bitnami.com/bitnami
+    condition: monitoring.metricsServer.enabled
+
+  - name: prometheus
+    version: 25.3.1
+    repository: https://prometheus-community.github.io/helm-charts
+    condition: monitoring.prometheus.enabled
+
+  - name: prometheus-adapter
+    version: 4.7.1
+    repository: https://prometheus-community.github.io/helm-charts
+    condition: monitoring.prometheusAdapter.enabled
+
+  # Observability components - Grafana dashboards and visualization
+  - name: grafana
+    version: 7.3.3
+    repository: https://grafana.github.io/helm-charts
+    condition: observability.grafana.enabled

charts/eoapi-support/.helmignore

@@ -14,6 +14,8 @@ A Helm chart for deploying Earth Observation APIs with integrated STAC, raster,
 - Flexible database configuration
 - Real-time PostgreSQL notifications for STAC item changes
 - Unified ingress system
+- Autoscaling
+- Integrated observability (Prometheus & Grafana)
 
 ## TL;DR
 

charts/eoapi-support/Chart.yaml

@@ -0,0 +1,80 @@
+{{/*
+Common monitoring configurations to avoid duplication across values files
+*/}}
+
+{{/*
+Basic monitoring stack configuration
+*/}}
+{{- define "eoapi.monitoring.basic" -}}
+metricsServer:
+  enabled: true
+  apiService:
+    create: true
+prometheus:
+  enabled: true
+  alertmanager:
+    enabled: false
+  prometheus-pushgateway:
+    enabled: false
+  kube-state-metrics:
+    enabled: true
+  prometheus-node-exporter:
+    enabled: true
+    resources: {{- include "eoapi.resources.small" . | nindent 6 }}
+  server:
+    service:
+      type: ClusterIP
+{{- end -}}
+
+{{/*
+Production monitoring with persistence
+*/}}
+{{- define "eoapi.monitoring.production" -}}
+metricsServer:
+  enabled: true
+  apiService:
+    create: true
+prometheus:
+  enabled: true
+  alertmanager:
+    enabled: true
+  prometheus-pushgateway:
+    enabled: false
+  kube-state-metrics:
+    enabled: true
+  prometheus-node-exporter:
+    enabled: true
+    resources: {{- include "eoapi.resources.small" . | nindent 6 }}
+  server:
+    service:
+      type: ClusterIP
+    persistentVolume:
+      enabled: true
+      size: 10Gi
+{{- end -}}
+
+{{/*
+Testing monitoring with minimal resources
+*/}}
+{{- define "eoapi.monitoring.testing" -}}
+metricsServer:
+  enabled: true
+  apiService:
+    create: true
+prometheus:
+  enabled: true
+  alertmanager:
+    enabled: false
+  prometheus-pushgateway:
+    enabled: false
+  kube-state-metrics:
+    enabled: true
+  prometheus-node-exporter:
+    enabled: true
+    resources: {{- include "eoapi.resources.small" . | nindent 6 }}
+  server:
+    service:
+      type: ClusterIP
+    persistentVolume:
+      enabled: false
+{{- end -}}