docs(self-hosted): rework for troubleshooting redis page

[aldy505]

DESCRIBE YOUR PR

Current "Troubleshooting Redis" documentation for documentation is outdated and no longer relevant. Due to changes with Taskbroker and recent issues with how Redis is being used in the whole self-hosted Sentry stack, it makes sense to make the documentation more proper.

IS YOUR CHANGE URGENT?

Help us prioritize incoming PRs by letting us know when the change needs to go live.

• Urgent deadline (GA date, etc.):
• Other deadline:
• None: Not urgent, can wait up to 1 week+

SLA

• Teamwork makes the dream work, so please add a reviewer to your PRs.
• Please give the docs team up to 1 week to review your PR unless you've added an urgent due date to it.
  Thanks in advance for your help!

PRE-MERGE CHECKLIST

Make sure you've checked the following before merging your changes:

• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs (subject matter experts)
• PR was reviewed and approved by a member of the Sentry docs team

LEGAL BOILERPLATE

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

EXTRA RESOURCES

• Sentry Docs contributor guide

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
develop-docs	Ready	Preview, Comment	May 12, 2026 1:44am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
sentry-docs	Ignored	Preview	May 12, 2026 1:44am

[sentry]

Bug: The xargs redis-cli del command will fail with a confusing error if no keys match the pattern because xargs is used without the -r flag.
_{Severity: LOW}

Suggested Fix

Add the -r (or --no-run-if-empty) flag to the xargs command. This will prevent xargs from executing redis-cli del if the standard input from the redis-cli --scan command is empty, thus avoiding the error.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: develop-docs/self-hosted/troubleshooting/redis.mdx#L46

Potential issue: The troubleshooting command `redis-cli --scan --pattern 'span-buf:*' |
xargs redis-cli del` will fail if no keys match the given pattern. The `xargs` command,
when it receives no input, will still execute `redis-cli del` but with no arguments.
This causes Redis to return a `(error) ERR wrong number of arguments for 'del' command`,
which could mislead a user into thinking the command is incorrect or their Redis
instance has a problem, when in fact no keys needed to be deleted.

_{Did we get this right? 👍 / 👎 to inform future reviews.}

[markstory]

We don't store authentication sessions in Redis though. Our sessions are cookie only. We do store data in the session during SSO provider setup flows though. If you're looking to enumerate the other ways we use Redis, you might want to include:

1. Rate limiter for requests to Sentry, and Snuba.
2. As a buffer for events during error & transaction processing.
3. As a buffer for span ingestion.