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Add observability module: Spring AI built-in meters and spans, cost per endpoint from token usage, Prometheus and Grafana dashboard

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01JXVi2GMQ7bR5EmbUFdDj7N
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Claude
2026-10-09 06:39:21 +00:00
parent 65f580c5bc
commit cc2a1b8bcb
45 changed files with 1731 additions and 0 deletions
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observability/scripts/run-all.sh
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#!/usr/bin/env bash
# Regenerates every file in output/: 01-07 from the test suite, 08-09 from the live Prometheus + Grafana stack.
# Needs JDK 25 and Maven on PATH, plus the Prometheus and Grafana tarballs unpacked (see stack-up.sh).
set -euo pipefail
cd "$(dirname "$0")/.."
mvn -q -B test
scripts/stack-up.sh
trap 'scripts/stack-down.sh' EXIT
scripts/load.sh 12
sleep 8
{ echo "# Prometheus metric families this app exposes at /actuator/prometheus (TYPE lines only)"; echo
curl -s 127.0.0.1:8080/actuator/prometheus | grep -E '^# TYPE (gen_ai_|spring_ai_|app_ai_)' | sort; } > output/09-prometheus-families.txt
scripts/verify-dashboard.py output/08-dashboard-queries.txt