PostHog / PostHog/posthog

Create Ingestion Warning when invalid session id is provided

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enhancement feature/ingestion
Dominant language
Python
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Description

Feature request

Is your feature request related to a problem?

When a customer sends invalid session ids that don't match our requirements, we don't seem to warn them of this.

It would be good if we did a little more to warn them.

Describe the solution you'd like

At the very least, adding a section to ingestion warnings would be a start. Even better if we can properly put a banner at the top to warn them as well.

Describe alternatives you've considered

Additional context

Debug info
- [ ] PostHog Cloud, Debug information: [please copy/paste from https://us.posthog.com/settings/project-details#variables]
- [ ] PostHog Hobby self-hosted with `docker compose`, version/commit: [please provide]
- [ ] PostHog self-hosted with Kubernetes (deprecated, see [`Sunsetting Kubernetes support`](https://posthog.com/blog/sunsetting-helm-support-posthog)), version/commit: [please provide]

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reading the linked custom session ID requirements and tracing where ingestion warnings are generated and displayed. Determine how invalid session IDs are detected, then confirm that the resulting warning appears in the ingestion warnings area and, if supported by the existing design, in the requested banner.

Written by the indexing model from the issue text.

Assessment

Domain
backend
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
45/100

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