Observability Hub

Proxync v0.2.0 introduces the Observability Hub, a zero-config, real-time performance dashboard for monitoring your local servers, edge tunnels, and public webhooks.

Overview

The Observability Hub analyzes live HTTP traffic running through your local intercepting Rust proxy without requiring extra SDKs, agents, or cloud integrations.

Key observability metrics include:

• Percentile Latency Metrics — P50, P90, and P99 latency calculation across active requests.
• Status Code Distribution Gauge — Visual heatmap tracking 2xx Success, 3xx Redirect, 4xx Client Error, and 5xx Server Error response volume.
• Total Bandwidth Meter — Real-time payload size tracking (KB/MB transferred through active edge tunnels).
• Public Webhook Interception Stream — Captures external incoming webhooks (Stripe, GitHub, Shopify) with 1-click Webhook Replay directly into Playground.
• Error Center — Consolidates proxy runtime errors (4xx, 5xx, DNS failures, TCP disconnects) into a unified, filterable issue list.
• Slowest Routes Leaderboard — Ranks API routes by max and average latency to isolate performance bottlenecks.

Dashboard Breakdown

The Observability Hub displays telemetry across four core panels:

1. Metrics Header — P50, P90, P99 response latencies, total bandwidth served, active tunnel count, and current telemetry mode badge.
2. Status Code Gauge — Visual percentage distribution of 2xx, 3xx, 4xx, and 5xx response codes.
3. Webhook Interceptor — Incoming external webhooks with payload previews and 1-click replay.
4. Playground — Replay or tweak incoming webhooks and slow API calls instantly.

Telemetry Modes (Enhanced vs Basic)

You can toggle between two telemetry execution modes under Settings:

1. Enhanced Telemetry (Default)

Computes full percentile math ($P50, P90, P99$), route performance rankings, and bandwidth meters. Designed for standard development environments.

2. Basic Telemetry (Low-CPU Mode)

Bypasses array sorting and non-fatal percentile math to minimize CPU/RAM computational overhead on resource-constrained systems, logging only critical 5xx server errors. An active Low CPU Mode banner indicates when Basic telemetry is active.

1-Click Debugging Navigation

From the Observability Hub, you can jump directly into:

• Traffic Inspector — Inspect complete headers, raw body previews, and timing diagnostics for any flagged request.
• Playground (Postman Studio) — Replay or tweak incoming webhooks and slow API calls instantly.