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feat(dev): Add SENTRY_CELL_ROUTING env var that runs cell-routing mode locally #115852

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lynnagara merged 1 commit into from
May 20, 2026
+18 −0
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feat(dev): Add SENTRY_CELL_ROUTING env var that runs cell-routing mode locally #115852

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9 changes: 9 additions & 0 deletions .agents/skills/cell-architecture/SKILL.md
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Original file line number Diff line number Diff line change
Expand Up @@ -137,6 +137,15 @@ Project.objects.filter(teams__organizationmember__user_id=user_id)
| **Denormalize to control silo** | High QPS, paginated lists, eventual consistency acceptable. Replicate needed fields to a `@control_silo_model` via outboxes — single local query, no RPC. See **hybrid-cloud-outboxes** skill. |
| **API gateway fan-out** | Temporary stopgap only — breaks pagination, latency = slowest cell. |

## Running Cell-Routing Locally

```bash
devservices up --mode cell-routing # brings up synapse + deps
SENTRY_CELL_ROUTING=1 sentry devserver # or devservices serve
```

Only cell-scoped API XHRs (`/api/0/organizations/{slug}/*`) cross to Synapse on `:13000`; UI HTML and control API stay on the sentry devserver at `:8000`. The env var gates a block in `src/sentry/conf/server.py` that sets `system.region-api-url-template` to the Synapse port and flips `system:multi-region`. The frontend reads `regionUrl` from the bootstrap blob and routes cell XHRs there per `static/app/api.tsx:715`.

## Active Migration

> Remove this section once the migration is complete.
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9 changes: 9 additions & 0 deletions src/sentry/conf/server.py
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Expand Up @@ -3326,3 +3326,12 @@ def custom_parameter_sort(parameter: dict) -> tuple[str, int]:

if SILO_DEVSERVER or IS_DEV:
SYNAPSE_HMAC_SECRET = ["synapse-dev-secret"]

if IS_DEV and os.environ.get("SENTRY_CELL_ROUTING"):
# Pair with `devservices --mode cell-routing`. Cell-scoped API XHRs cross
# to Synapse on :13000; UI HTML and control API stay on the devserver.
SENTRY_OPTIONS["system.region-api-url-template"] = "http://dev.getsentry.net:13000"
SENTRY_OPTIONS["system.organization-base-hostname"] = "{slug}.dev.getsentry.net:8000"
SENTRY_OPTIONS["system.organization-url-template"] = "http://{hostname}"
SENTRY_FEATURES["system:multi-region"] = True
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@markstory markstory May 20, 2026

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With this flag on sentry is going to want to be run in siloed mode and I think behind ngrok.

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@lynnagara lynnagara May 20, 2026

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i wasn't using ngrok in my testing, it doesn't seem to be required

SENTRY_LOCAL_CELL = SENTRY_LOCAL_CELL or "--monolith--"
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