Open-source observability for traces, logs & metrics — built on OpenTelemetry + ClickHouse.

Maple Monorepo

Maple is now organized as a monorepo with a SPA frontend and an Effect-based backend API.

Workspace Layout

• apps/web: TanStack Router SPA (Vite)
• apps/api: Effect HTTP API (Tinybird proxy + MCP server code + AI chat/triage on @opencode-ai/ai)
• apps/ingest: OTLP ingest gateway (key auth + org enrichment + collector forwarding)
• apps/landing: Astro landing site
• apps/alerting: Alert evaluation worker
• apps/cli: CLI utilities
• apps/ios: Native SwiftUI app (Clerk + v2 API)
• packages/domain: Shared Effect HTTP contracts and domain types
• packages/query-engine: Shared query and observability logic
• packages/ui: Shared UI primitives and components

Prerequisites

• Bun >=1.3

Install

bun install

Try Maple Locally

Run Maple as a single local binary with OTLP ingest, embedded ClickHouse, and the dashboard:

brew install Makisuo/tap/maple
maple start

See docs/local-mode.md for Homebrew, manual installer, update, and uninstall details.

Develop

Run the whole stack — the Cloudflare Workers under alchemy's local runtime, the rest as child processes of the same alchemy dev — behind https://.localhost:

bun dev

Or just some of it (api, alerting, electric-sync, web, landing, ingest, local-ui, scraper):

bun dev api web

A single non-Worker app can also run on its raw port, outside the stack:

bun --filter=@maple/web dev

Validate

bun run typecheck
bun run build
bun run test

Docker (Local)

Run the local multi-service stack (API + web + ingest + otel collector):

docker compose -f docker-compose.yml up --build

Services:

• API: http://localhost:3472
• Web: http://localhost:3471
• Ingest: http://localhost:3474
• OTEL collector: 4317 (gRPC), 4318 (HTTP), 13133 (health/extensions)

Cloudflare Deploy (Alchemy)

Deployments run on Alchemy v2 (Effect-based): the root alchemy.run.ts exports a single Alchemy.Stack("maple", …) whose program yields one module per app:

• apps/api/src/worker.ts — the api Worker: Hyperdrive (PlanetScale Postgres) MAPLE_DB,

• apps/alerting/src/worker.ts — cron-driven alerting Worker (cross-script workflow ref)
• apps/electric-sync/src/worker.ts — ElectricSQL shape-proxy Worker
• apps/web/src/worker.ts / apps/landing/src/worker.ts / apps/local-ui/src/worker.ts

Stage grammar is prd / pr- / dev names, resolved via @maple/infra/cloudflare (parseMapleStage, resolveMapleDomains, resolveWorkerName, resolveHyperdriveRefId, resolveDatabaseMode). prd binds the dashboard-managed Hyperdrive by config ID (resolveHyperdriveRefId) — origin credentials never touch a deploy. MAPLE_PG_URL is only needed for dev stages, whose Hyperdrive alchemy manages itself. PR previews bind no database at all (resolveDatabaseMode → "none"): DB-backed routes 500, everything else in the preview works.

Run locally:

PR_NUMBER=123 bun run alchemy:deploy:pr

The first v2 deploy against a stage with live v1-created resources needs --adopt (the pr script passes it already); v1 state is incompatible and simply abandoned — never run a v1 alchemy destroy against a live stage.

Tear down:

PR_NUMBER=123 bun run alchemy:destroy:pr

CI workflows:

• PRD (manual only via workflow_dispatch): .github/workflows/deploy-prd.yml
• PR preview lifecycle: .github/workflows/deploy-pr-preview.yml (pull_request opened/synchronize/reopened/closed)

• Secrets are fetched from Infisical via Infisical/secrets-action using OIDC

• Infisical environments (prod, dev — mapped from the old Doppler

Setup note: the machine identity must have a GitHub OIDC auth method configured in Infisical (scoped to this repo, ideally to the production/pr-preview GitHub environments) and read access to the project. The workflows select secrets via project-slug (INFISICAL_PROJECT_SLUG) and per-stage env-slug (prod/dev).

Runtime API URL behavior:

• Deploy-time web builds resolve VITE_API_BASE_URL from the Cloudflare api worker domain (api.maple.dev in prd, worker.dev URL for pr-*).
• Local bun --filter=@maple/web dev can still use root .env VITE_API_BASE_URL for local API routing.

Environment

• Canonical env example: .env.example
• API-only env example: apps/api/.env.example
• Real .env values are local-only and should stay untracked.

For ingest + key auth, set these at minimum in your root .env when running the ingest gateway:

• MAPLE_INGEST_KEY_LOOKUP_HMAC_KEY
• MAPLE_INGEST_KEY_ENCRYPTION_KEY (required when ingest reads encrypted credentials from Postgres)
• INGEST_PORT
• INGEST_FORWARD_OTLP_ENDPOINT
• MAPLE_INTERNAL_ORG_ID (the org the gateway's own telemetry is filed under; no default)
• INGEST_FORWARD_TIMEOUT_MS
• INGEST_MAX_REQUEST_BODY_BYTES
• INGEST_REQUIRE_TLS
• INGEST_REPLAY_MAX_SESSION_BYTES (optional; ceiling on the decompressed rrweb

Persistence (PostgreSQL / PGlite)

Maple persists application state in PostgreSQL:

• Production uses PlanetScale Postgres through Cloudflare Hyperdrive.
• Wrangler development uses the Docker Postgres started by bun db:up.
• Non-Worker local entrypoints use embedded PGlite under apps/api/.data/pglite; set

Migration commands:

bun db:up
bun db:migrate:local
bun run --cwd packages/db db:generate
bun run --cwd packages/db db:studio

CI migrates deployed PlanetScale branches over their direct port before Alchemy deploys the Workers. See docs/persistence.md for the full workflow.

Ingest Keys

• Maple now manages per-org ingest keys in the database (public + private).
• Keys are available in Settings and can be rerolled independently.
• Reroll revokes the previous key immediately.
• Private ingest keys are encrypted at rest with MAPLE_INGEST_KEY_ENCRYPTION_KEY (base64-encoded 32-byte key).
• Ingest key lookup/auth uses non-reversible HMAC hashes via MAPLE_INGEST_KEY_LOOKUP_HMAC_KEY.

Auth Modes

Maple supports exactly two auth modes via MAPLE_AUTH_MODE:

1. clerk

1. self_hosted

Start apps:

bun --filter=@maple/api dev
bun --filter=@maple/web dev

Validate behavior:

• Clerk mode:

• Self-hosted mode:

Breaking change:

• Self-hosted multi-tenant JWT/API-key auth paths were removed.
• MAPLE_ROOT_PASSWORD is now required when MAPLE_AUTH_MODE=self_hosted.