evaluation metrics

Make your Bash prompt fast, informative, and safe with this practical guide: build a lean PS1 using built-ins and proper ANSI markers, add instant Git context via __git_ps1, show long command durations without overhead, and color‑code root/SSH; includes copy‑paste snippets, apt/dnf/zypper installs for Starship/Liquidprompt/Powerline, plus profiling and PROMPT_COMMAND tips to avoid slow subshells and clutter.

Turn RAG from guesswork to observability with drop-in Bash: define the right metrics (retrieval overlap/groundedness, latency p50/p95, error and cache rates, token cost, freshness), log every turn as JSONL, compute rolling stats with rag-metrics.sh, export Prometheus textfile gauges, trigger Slack/email alerts via rag-alert.sh, and gnuplot quick charts—catch drift, cut latency, and rein in spend.