Kyle Isom ffc31f7d55 Add Prometheus metrics for connections, firewall, L7, and bytes transferred ...

Instrument mc-proxy with prometheus/client_golang. New internal/metrics/
package defines counters, gauges, and histograms for connection totals,
active connections, firewall blocks by reason, backend dial latency,
bytes transferred, L7 HTTP status codes, and L7 policy blocks. Optional
[metrics] config section starts a scrape endpoint. Firewall gains
BlockedWithReason() to report block cause. L7 handler wraps
ResponseWriter to record status codes per hostname.

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

2026-03-25 18:05:25 -07:00

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