feat(supervisor): workload create duration histogram with backend and outcome labels

[myftija]

Adds a workload_create_duration_seconds Prometheus histogram to the supervisor, observed around the workload manager create() call:

• backend label: kubernetes | compute | docker — set once from the configured workload manager
• outcome label: success | error — the per-outcome counts double as a create error rate

Registered on the supervisor's existing metrics registry, so it's exposed on the existing /metrics endpoint with no config changes.

Notes:

• Covers cold creates only; warm starts and restores return before reaching create().
• A create may include backend-internal retries, so one observation can span multiple attempts.
• Fixed low cardinality: 2 active label sets per deployment × 10 buckets.

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📚 Learning: 2026-05-14T14:54:39.095Z

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Learning: When handling Prisma error P1001 ("Can't reach database server") in TypeScript, don’t assume a single error shape. Prisma can surface P1001 via two different error classes/fields: `PrismaClientKnownRequestError` exposes it as `err.code === "P1001"` (common during mid-query connection drops), while `PrismaClientInitializationError` exposes it as `err.errorCode === "P1001"` (common on client startup failure). Therefore, predicates should use `err.code === "P1001" || err.errorCode === "P1001"`. Do not flag `err.code === "P1001"` as “unreachable/never matches,” as it is expected in production.

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Repo: triggerdotdev/trigger.dev PR: 3632
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Learning: When handling Prisma errors for P1001 ("Can't reach database server"), do not assume it only appears under a single property name. Prisma may surface P1001 via either `PrismaClientKnownRequestError` (`err.code === "P1001"`, e.g., mid-query connection drops) or `PrismaClientInitializationError` (`err.errorCode === "P1001"`, e.g., client startup connection failure). To reliably detect the condition, check `err.code === "P1001" || err.errorCode === "P1001"`, and avoid review rules that would incorrectly flag `err.code === "P1001"` as unreachable/never-matching.

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Repo: triggerdotdev/trigger.dev PR: 3836
File: apps/supervisor/src/backpressure/backpressureMonitor.ts:3-5
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🔇 Additional comments (7)

.server-changes/workload-create-duration-metric.md (1)

1-6: LGTM!

apps/supervisor/src/index.ts (6)

24-24: LGTM!

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524-527: LGTM!

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Walkthrough

This pull request adds observability to workload creation operations in the supervisor by instrumenting the process with a Prometheus histogram metric. The change introduces a new workload_create_duration_seconds histogram that records the duration of each workload creation attempt, labeled with the backend type (compute, kubernetes, or docker) and outcome (success or error). The supervisor now tracks which backend implementation is active and records metric observations on both successful and failed creation paths.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a workload create duration histogram metric with backend and outcome labels to the supervisor.
Description check	✅ Passed	The description covers the core functionality and design decisions but does not include all template sections (checklist, testing, changelog, screenshots), though these may not all be required.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
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