Seer pricing (#13867)

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## DESCRIBE YOUR PR
Updating pricing for Seer launch, see
https://sentry-docs-git-seer-pricing.sentry.dev/pricing/ for preview.

## 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.): <!-- ENTER DATE HERE -->
- [x] Other deadline: Seer launches first week of June
- [ ] 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](https://github.com/orgs/getsentry/teams/docs)

## LEGAL BOILERPLATE

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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](https://docs.sentry.io/contributing/)

---------

Co-authored-by: Alex Krawiec <[email protected]>

Author: 2 people

docs/pricing/index.mdx

@@ -38,6 +38,7 @@ We bill based on the amount of data processed. Each [paid plan](https://sentry.i
 - 1GB of attachments
 - Continuous profiling (available only through PAYG)
 - UI Profiling (available only through PAYG)
+- Seer (available only through purchase of Seer)
 
 On top of that, you can set aside a PAYG budget that can be used to send additional data in any category. Alternatively, you can choose to pay ahead of time to reserve additional volume at a discounted price. Any unused reserved volume will expire at the end of each billing month.
 
@@ -130,6 +131,36 @@ All Sentry plans include one cron monitor and one uptime monitor. Additional mon
 | --------------- | ------------- | --------- | ----------------- | ------------- |
 | >1GB            | $0.2500       | $0.3125   | $0.2500           | $0.3125       |
 
+#### Seer Pricing
+
+Seer is Sentry's AI agent that triages, debugs, and fixes application issues automatically. Access Seer by adding it to your existing subscription for an additional $20 per month. This $20 gives you $25 worth of Seer event credits, which can be used for any combination of [Issue Scans](/pricing/#issue-scans) or [Issue Fixes](/pricing/#issue-fixes) (see pricing tables below). Any usage beyond this $25 credit will draw from your [PAYG budget](/pricing/#terminology).
+
+{/* More details on how to understand your Seer usage is available here. */}
+{/* TODO: Add line above when the link is available */}
+
+#### Issue Scans
+
+Issue Scan automatically classifies and triages issues to determine which are the most likely to be fixable with a code change. Issue Scans are billed per run.
+
+| Issue Scan Volume | Team PAYG     | Business PAYG |
+| ----------------- | ------------- | ------------- | 
+| >0-10k            | $0.0030000    | $0.0030000    |
+| >10k-100k         | $0.0027000    | $0.0027000    |
+| >100k-500k        | $0.0024300    | $0.0024300    | 
+| >500k             | $0.0021870    | $0.0021870    | 
+
+#### Issue Fixes
+
+Issue Fix performs a deep root cause analysis of an issue, using all of the context that is available to Sentry, generating a code fix, and opening a Pull Request in Github.
+
+Issue Fixes are billed per run. Interactions with the same run will only be billed once; restarting a run with the "Start Over" button will be billed as a separate run.
+
+| Team PAYG     | Business PAYG |
+| ------------- | ------------- |
+| $1.00/run     | $1.00/run     |
+
+
+
 ## Billing Cycles
 
 <Alert>
@@ -227,6 +258,7 @@ As of December 1, 2020, customers with a US-based billing address may be subject
 - Texas
 - Tennessee
 - Utah
+- Vermont
 - Washington
 
 ### Canadian Taxes