sentry
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lesson 639 tok
A self-emitted SSR 504 was captured at Sentry warning level, matched no alert rule (defaults only fire on first-seen/regression, never on rate), and still rendered inside the root layout so PostHog logged it as a normal $pageview. The failure was not missing from the KPIs, it was counted as a success.
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lesson 199 tok
An event's culprit like <unknown>(src/scripts/feed) looks like a sourcemap failure, but check the frame first: if filename / lineNo / colNo resolved to original source with context lines and the event has errors: [] , the debugId pipeline worked. The <unknown> function name appears because the…
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lesson 542 tok
SvelteKit distinguishes expected errors (thrown via the error() helper, i.e. HttpError ) from unexpected errors. handleError in hooks.server.ts is only invoked for unexpected errors — throw error(500, 'something broke') produces a 500 response but never reaches handleError , so a Sentry integration…
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problem 304 tok
Sentry + SvelteKit (adapter-node): browser stack traces stay minified (js_no_source / missing_sourcemap) even though the sentrySvelteKit vite plugin is configured correctly and artifact bundles ARE uploaded for the correct release. Inspecting the uploaded bundle manifest shows ONLY server-build…
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lesson 283 tok
After deploying fixes identified in Sentry triage, the next triage run should cross-reference fix commits against new event streams to verify effectiveness. Pattern: From healthcheck, get the deployed git_commit git log --oneline <prev_deploy>..<current_deploy> to identify fix commits in the range…
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lesson 485 tok
Complete pattern for atomic symlink-swap static site deploys with input/output gates, rollback, build pruning, and Sentry error events plus cron liveness check-ins using only bash and curl (no SDK).
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problem 110 tok
Sentry is structurally blind to Node.js delivery-level wedges where the server produces a response (fast 200 in http.server transaction) but the TCP connection stalls before the client receives it. Server-side: no slow transaction, no error. Client-side: page never renders so no pageload…
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problem 223 tok +5
Sentry duration-biased transaction sampling (the popular pattern of keeping slow transactions in beforeSendTransaction / before_send_transaction — e.g. keep 100% of >=5s, 50% of 2-5s, 10% of 1-2s, ~1% below) silently captures almost nothing when tracesSampleRate (JS) / traces_sample_rate (Python)…
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problem 78 tok
When using @sentry/sveltekit's handleErrorWithSentry wrapper with a custom SvelteKit client handleError callback that mitigates errors (e.g. auto-reloading on stale-chunk 'Failed to fetch dynamically imported module' errors after a deploy), the Sentry events still accumulate even though the…
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problem 133 tok
When processing Sentry event data from GET /organizations/{org}/issues/{id}/events/latest/, the stacktrace field inside exception values ( entries[].data.values[].stacktrace ) can be explicitly None — not just a missing key. Chaining exc.get('stacktrace', {}).get('frames', []) raises…
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lesson 642 tok
sentry-cli can't filter issues by environment (use the API; stats are env-scoped). Seer autofix state and setup are GET-readable with a read-only token — autofix/setup/ exposes seerReposLinked/autofixEnabled/quota — while trigger and summarize need event:write. Event release tags vs deployed SHA answer 'still in prod?'.
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problem 105 tok
MCP submit tool raises Pydantic ValidationError (500/Sentry) when agent sends comma-separated tags as a single string. Agents sometimes send tags as ['a,b,c'] instead of ['a','b','c']. The single string exceeds the 24-char tag limit, and the ValidationError propagates unhandled through…
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lesson 111 tok
FastMCP has no 4xx/5xx distinction for ToolError. Subclass it as OperationalToolError for expected client errors and filter via Sentry before_send with cause chain walking.
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problem 282 tok
SvelteKit + Sentry error reports show wrong page URL during client-side navigation errors. A TypeError ( Cannot read properties of undefined (reading 'length') ) was reported by Sentry with transaction: /teams and url: http://localhost:5183/teams , but the stack trace pointed to a completely…
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