docs(KNO-14363): document Amplitude source

[samseely]

Summary

• add an Amplitude source guide covering Webhooks Streaming and Cohort Webhooks
• document shared-secret verification, default identify and audience mappings, identity alignment, custom workflow and group mappings, retries, idempotency, and debugging
• add Amplitude to the sources sidebar and available-sources list

Validation

• yarn format.check
• yarn lint
• yarn type-check
• yarn build

Follow-up

• add Amplitude-specific setup screenshots once an authenticated hosted Control preview is available

Linear: KNO-14363

[linear-code]

KNO-14363

[vercel]

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	Jul 24, 2026 1:25am

[cursor]

Risk MEDIUM: Documents Amplitude as a new source integration with a new MDX page, sidebar entry, and overview listing.

Reasons

• A new MDX page is added at content/integrations/sources/amplitude.mdx (248 lines), which triggers the new-page rule.
• The sidebar navigation file data/sidebars/integrationsSidebar.ts is modified to add the Amplitude entry.
• 250 total additions across 3 files is a moderately sized content addition.
• The new page introduces several external Amplitude links and internal Knock doc links that should be verified for correctness.
• No HIGH-risk triggers: no component, layout, lib, config, or dependency changes.

Notes

• Verify that all external Amplitude documentation links resolve correctly (e.g., Webhooks Streaming, Cohort Webhooks, Identify API, retry mechanism, sync behaviors, FreeMaker templating, and user identity docs).
• Verify that all internal Knock doc links resolve (/concepts/environments, /concepts/audiences, /concepts/objects, /concepts/tenants, /integrations/sources/overview#source-event-idempotency, /integrations/sources/overview#triggering-actions-from-source-events, /integrations/sources/custom).
• Confirm the reused screenshot at /images/integrations/sources/sources-location.png is appropriate for the Amplitude setup context.
• The sidebar entry is added in alphabetical order before Clerk — confirm this matches the intended navigation ordering.
• Review the payload examples and action mapping tables for technical accuracy against the actual Amplitude webhook format and Knock source behavior.

  

_{Sent by Cursor Automation: Docs PR classifier}