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status-page

public status page and incident communication

Atlassian Statuspage, Instatus

SystemTechniques · 27Primitives · 93 status-page CDN and edgecloud · medium: CDNs cache content in hundreds of PoPs near users, cutting latency and egress bills; edge compute runs small code there. Bandwidth price spreads 10x between providers.›Cell based architecturedistributed · medium: Independent full-stack cells with a thin router to bound blast radiusDeterministic simulation testingdistributed · medium: Run the whole system in one thread under a seeded scheduler with simulated network, disk and clock, so every failure replays from its seed.›Primary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›Pub/sub fan-outdistributed · medium: Deliver one published message to every subscriber of a topic by sharing one encoded payload and giving each connection a bounded queue with an explicit slow-consumer policy.›Email delivery smtpnetworking · medium: Outbound SMTP: queues, MX lookup, retries, bounces, feedback loops and IP warm-upMobile push deliverynetworking · medium: Sending notifications through APNs and FCM: HTTP/2 requests, token hygiene, collapse keys, TTL and priority, and the retry rules that keep you un-throttled.›Health checkingsystems · low: Decide per backend whether to route to it using probes and real-traffic errors, with consecutive-count hysteresis, capped ejection and a panic fallback.›XML Streaming Parserstorage · low: Tokenize XML into start, text and end events in constant memory, so a few fields can be extracted from huge, broken or hostile documents.›Hdr histogramdata-structures · low: Log-linear bucketed histograms with bounded relative error for latency percentilesProcess supervisionhardware-os · low: A parent process starts services, reaps their exits and restarts them under a delay and burst-limit policy, then stops them with SIGTERM before SIGKILL.›Active path probingnetworking · low: Continuous loss/latency/jitter probes per WAN path to drive path selectionAnycastnetworking · low: Announce one IP prefix from many sites over BGP; routing sends each client to its preferred site, and a failed site leaves by withdrawing the route.›Sms encoding segmentationnetworking · low: GSM-7/UCS-2 encoding and concatenated SMS segmentation with UDHMutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Lttb downsamplingstatistics · low: Largest-Triangle-Three-Buckets: reduce a series to N points while keeping its visual shapeCron schedulingsystems · low: Cron expression parsing and next-fire-time computation, with catch-up and time-zone rulesGraceful drainingsystems · low: On a termination signal, stop taking new work, finish in-flight work until a deadline, tell clients to reconnect elsewhere, then exit; clients resume from a token.›Hierarchical state machinesystems · low: Nest states so a substate inherits its parent's reactions and only overrides what differs, with ordered entry and exit actions along the path.›Stale while revalidatesystems · low: Serving cached data past TTL while refreshing in the background, with request coalescingHTTP caching semanticsnetworking · low: The rules (RFC 9111) that decide whether a stored response is still fresh, and how a cheap conditional request revalidates it when it is not.›Consistent hashingdistributed · low: Hash nodes and keys onto a ring; each key belongs to the next node clockwise, so membership changes move only about 1/n of keys.›Cooperative schedulingconcurrency · low: Green threads/coroutines yielding at await points on a user-space scheduler+ 20 more techniques+ 77 more primitives

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