Observability

Overview

@repo/observability wires up Sentry for error tracking and BetterStack Logtail for structured logging. Every unhandled error, catch block, and error boundary reports to Sentry. In production, logs go to BetterStack; in development, they go to the console.

Architecture

packages/observability/
├── keys.ts              # env validation (Sentry DSN, BetterStack keys)
├── log.ts               # Logtail (prod) / console (dev) logger
├── error.ts             # parseError() — Sentry capture + logging
├── server-error.ts      # handleServerError() — parseError for server contexts
├── instrumentation.ts   # runtime dispatcher (Node.js / Edge)
├── server.ts            # Sentry init for Node.js
├── edge.ts              # Sentry init for Edge
├── client.ts            # Sentry init for browser (+ session replays)
└── next-config.ts       # withSentry(), withLogging() config wrappers

Wiring (apps/web)

Five files connect the web app to the observability package:

Environment variables are pulled in through env.ts which extends @repo/observability/keys.

Error handling utilities

parseError(error) — universal error parser

Located in packages/observability/error.ts. Used everywhere.

import { parseError } from "@repo/observability/error";

try {
  // ...
} catch (error) {
  parseError(error); // → Sentry captureException + log.error
  return NextResponse.json({ error: "..." }, { status: 500 });
}

What it does:

1. Extracts a message string from any error type (Error, object with .message, or stringifies)
2. Calls Sentry.captureException(error)
3. Calls log.error() (Logtail in prod, console in dev)
4. Returns the message string

Use this in API routes, webhooks, and non-React server code.

handleServerError(error) — server catch handler

Located in packages/observability/server-error.ts. A thin wrapper around parseError for server-side catch blocks.

import { handleServerError } from "@repo/observability/server-error";

try {
  // ...
} catch (error) {
  handleServerError(error); // → parseError (Sentry + Logtail)
  return [];
}

What it does:

1. Calls parseError(error) — Sentry capture + structured logging
2. Returns the error message string

Use this in server actions, queries, server components, and any server-side catch blocks.

When to use which

handleError(error) — client-side toast

Located in packages/ui-web/lib/handle-error.ts. For client components that need to show error toasts.

import { handleError } from "@repo/ui-web/lib/handle-error";

try {
  await someAction();
} catch (error) {
  handleError(error); // → parseError + toast.error(message)
}

Error boundaries

Three error boundaries catch unhandled errors and report to Sentry:

All follow the same pattern:

useEffect(() => {
  captureException(error);
}, [error]);

Action clients

@repo/lib/action-clients.ts uses parseError in handleServerError to report technical errors to Sentry before returning a translated user-facing message:

handleServerError: async (e) => {
  if (isUserFacingError(e.message)) return e.message;
  parseError(e); // → Sentry + Logtail
  const t = await getTranslations({ locale, namespace: "global.errors" });
  return t("unexpected");
},

Sentry features

Environment variables

All variables are optional. Without them, Sentry silently no-ops and logging falls back to console.

Graceful degradation