Sent Index

Chronological ledger of infrastructure/platform/system design digests emailed to nick@nickbytes.com.

Each entry should include:

• Date/time sent
• Topic
• Why it was chosen
• Source links
• Digest file path
• Email send command/status

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2026-05-09 08:00 PDT — Track A / Lesson 1

• Topic: Incident overview: what failed, customer impact, timeline, and why the Coinbase outage matters
• Why it was chosen: First unsent lesson in Track A, the required short Coinbase outage concept series that opens the course.
• Source links:

- Local case study: case-studies/2026-05-07-coinbase-multi-hour-service-disruption.md - https://x.com/rwitoff/status/2052863502424133949 - https://api.fxtwitter.com/status/2052863502424133949 - https://sre.google/sre-book/managing-incidents/ - https://sre.google/sre-book/addressing-cascading-failures/

• Digest file path: digests/2026-05-09-coinbase-outage-incident-overview.md
• Case studies used: case-studies/2026-05-07-coinbase-multi-hour-service-disruption.md
• Email send command/status: /usr/bin/mail -s "Infra/System Design Daily: Coinbase outage overview" nick@nickbytes.com < digests/2026-05-09-coinbase-outage-incident-overview.md — exited 0, but later verification showed the message remained queued in local Postfix (mailq showed E52818039B17 for nick@nickbytes.com), so delivery was not verified.