Add Forgejo metrics + upstream latency histogram to Fly proxy dashboard

- Enable Forgejo /metrics endpoint (app.ini [metrics] section)
- Add Alloy scrape target for Forgejo metrics on indri
- Add upstream_response_time histogram to Fly proxy Alloy config
- Replace single p95 panel with p50/p90/p99 + upstream breakdown
  filtered to forge.eblu.me host

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ansible/roles/alloy/defaults/main.yml

@@ -101,6 +101,10 @@ alloy_op_vault: vg6xf6vvfmoh5hqjjhlhbeoaie
 alloy_op_postgres_item: guxu3j7ajhjyey6xxl2ovsl2ui
 alloy_op_postgres_field: alloy-user-pw
 
+# Forgejo metrics collection
+alloy_collect_forgejo: true
+alloy_forgejo_port: 3001
+
 # macOS power metrics collection (via powermetrics, requires root)
 alloy_collect_power_metrics: true
 alloy_power_metrics_script: /usr/local/bin/macos-power-metrics

ansible/roles/alloy/templates/config.alloy.j2

@@ -74,6 +74,18 @@ prometheus.scrape "zot" {
 }
 {% endif %}
 
+{% if alloy_collect_forgejo | default(false) %}
+// ============== FORGEJO METRICS ==============
+
+// Scrape Forgejo's native metrics endpoint
+prometheus.scrape "forgejo" {
+  targets         = [{"__address__" = "localhost:{{ alloy_forgejo_port }}"}]
+  metrics_path    = "/metrics"
+  forward_to      = [prometheus.relabel.instance.receiver]
+  scrape_interval = "{{ alloy_scrape_interval }}"
+}
+{% endif %}
+
 {% if alloy_collect_logs %}
 // ============== LOG COLLECTION ==============
 

ansible/roles/forgejo/templates/app.ini.j2

@@ -95,6 +95,11 @@ ACCOUNT_LINKING = login
 USERNAME = nickname
 REGISTER_EMAIL_CONFIRM = false
 
+[metrics]
+ENABLED = true
+ENABLED_ISSUE_BY_LABEL = false
+ENABLED_ISSUE_BY_REPOSITORY = false
+
 [actions]
 ENABLED = {{ forgejo_actions_enabled | lower }}
 DEFAULT_ACTIONS_URL = {{ forgejo_actions_default_url }}