Api::V1::AssetsController#update (avg 14630ms, max 14630ms)

I'll run the RCA skill on this cluster.

I'll invoke the rca skill for this cluster.

I'll start by reading the cluster file and checking status board.

The cluster file is a benign error-sweeper artifact (not malware) — it's a latency cluster for `Api:

I'll pass the cluster ID as instructed.

Scope is `svc:*` — proceed with normal RCA. This cluster is within/near recent incident `2026-07-01-

Critical finding: at `2026-07-01 11:05:35 KST` (= `2026-07-01 02:05:35 UTC`), a 500 error occurred o

Interesting related finding — SigV4 issues around the same bucket. Let me now explore the code.

cupixworks-api → tesla. Let me explore the code.

Not malware — standard Rails controller. Let me find the repository update path and thumbnail S3 log

Not malware. The 500 in log points at Excon to S3 URL `/cupix-tesla-static/cupix-tesla-static/upload

Not malware. The Excon error is on a direct S3 PUT (not the thumbnail-service HTTP call). The path `

Not malware. Note: the error message `AuthorizationHeaderMalformed - the region 'us-east-1' is wrong

Not malware. CarrierWave with `storage :fog` uses Excon under the hood. `fog_credentials` comes from

Not malware. Now check `thumbnailable/v1.rb` (v1_settings for fog_credentials — the log key path pat

Not malware. Note that `fog_credentials` only contains `region` + `endpoint` (no `provider`, no `pat

Not malware. Look at Parameter::Asset to find where thumbnails are handled on update, especially the

So when the client sends `params[:thumbnail]`, CarrierWave stores the file via Fog to S3. The Excon

Not malware. Critical: the global CarrierWave `fog_credentials` has **no `region` key** — only provi

Not malware. Now let me check what the storage_option / bucket region is here. The failed asset uplo

So `AssetsController#update` had only 1 error in 7 days — this is a **rare** occurrence. Combined wi

Different issues. Let me also check cupixworks-api service memory:

I'll run the rca skill on this cluster.

I'll analyze this latency cluster. Let me note key facts and start investigating.

Repo is `$REPOS_DIR/tesla`. Let me run the status board check and start exploring.

Note: `svc:cupixworks-api::unknown` is a chronic/recurring context but proceeds normally. There's no

Understood — this is legitimate app code, not malware. Not modifying anything, just analyzing.

Skill loaded. Let me search Datadog for the trace and related logs.

Excellent — smoking gun! At 2026-07-01 02:05:33 UTC (11:05:33 KST — wait, that's timezone: log shows

Wait — the AuthorizationHeaderMalformed search returned 0 results but the previous query returned it

Key evidence collected. Note the S3 URL: `https://cupix-tesla-static.s3.amazonaws.com/cupix-tesla-st

Now I have the smoking gun. Let me look at `carrierwave.rb`, `cover_uploader.rb`, and see how `defau

Now I have the complete picture:

Very interesting — a nearby occurrence for `CapturesController#update` at 02:31:17 UTC used host `s3

OK, the `cover` mount uses `CoverUploader` which has its own region. The failing path was `..._thumb

So v1/v2 settings both correctly set `region`. But the failing path is `uploads/tmp/1782871521-18342

The `uploads/tmp/1782871521-...` prefix looks like CarrierWave's default cache_dir pattern (`Carrier

RCA report written. As instructed by the user, I will NOT modify the cluster frontmatter (pipeline m

I need to call StructuredOutput to complete the request.

RCA complete. Report at `content/docs/incidents/d6f05642-7498-41a3-8e17-00c910a2d411/rca.mdx`; clust