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Add Prometheus metrics for connections, firewall, L7, and bytes transferred

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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>
This commit is contained in:
Kyle Isom
2026-03-25 18:05:25 -07:00
parent 42c7fffc3e
commit ffc31f7d55
16 changed files with 439 additions and 32 deletions
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8
go.mod
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@@ -14,14 +14,22 @@ require (
replace git.wntrmute.dev/kyle/mcdsl => /home/kyle/src/metacircular/mcdsl
require (
github.com/beorn7/perks v1.0.1 // indirect
github.com/cespare/xxhash/v2 v2.3.0 // indirect
github.com/dustin/go-humanize v1.0.1 // indirect
github.com/google/uuid v1.6.0 // indirect
github.com/inconshreveable/mousetrap v1.1.0 // indirect
github.com/mattn/go-isatty v0.0.20 // indirect
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
github.com/ncruces/go-strftime v1.0.0 // indirect
github.com/pelletier/go-toml/v2 v2.3.0 // indirect
github.com/prometheus/client_golang v1.23.2 // indirect
github.com/prometheus/client_model v0.6.2 // indirect
github.com/prometheus/common v0.66.1 // indirect
github.com/prometheus/procfs v0.16.1 // indirect
github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
github.com/spf13/pflag v1.0.9 // indirect
go.yaml.in/yaml/v2 v2.4.2 // indirect
golang.org/x/sys v0.42.0 // indirect
golang.org/x/text v0.32.0 // indirect
google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 // indirect