Drawing examples

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flowchart TD
    subgraph Source ["Source Control"]
        A[Developer Workstation]
        B([Git Repository])
        C{{Webhook Trigger}}
    end

    subgraph Validate ["Validation Stage"]
        D[Lint Check]
        E[Security Scan]
        F{All Checks Pass?}
    end

    subgraph Build ["Build and Test"]
        G[Unit Tests]
        H[Integration Tests]
        I[[Test Results Store]]
        J[Build Artifacts]
        K([Artifact Registry])
    end

    subgraph Deploy ["Deployment"]
        L[Deploy to Staging]
        M{Health Check}
        N[Run Smoke Tests]
        O{Smoke Tests Pass?}
        P[Deploy to Production]
        Q[[Production Store]]
        R([CDN Cache Purge])
    end

    subgraph Errors ["Error Handling"]
        S[Rollback]
        T[Notify Developer]
        U[[Send Alert Email]]
    end

    A --> B
    B --> C
    C -->|trigger| D
    D --> E
    E --> F
    F -->|yes| G
    F -.->|no| S
    G --> H
    H --> I
    H --> J
    J --> K
    K --> L
    L --> M
    M -->|healthy| N
    M -.->|unhealthy| S
    N --> O
    O -->|pass| P
    O -.->|fail| S
    P --> Q
    P --> R
    S --> T
    T --> U

    classDef green fill:#e7f3ec,stroke:#1f6f43,stroke-width:2px,color:#0f3d26
    classDef red fill:#fde2e1,stroke:#b42318,stroke-width:2px,color:#7a271a
    classDef blue fill:#e8f4f8,stroke:#2980b9,stroke-width:2px,color:#1a5276
    classDef amber fill:#fff8e1,stroke:#f57c00,stroke-width:2px,color:#4e2600
    classDef dark fill:#2d4a3e,stroke:#0f3d26,stroke-width:2px,color:#ffffff
    classDef teal fill:#e0f7fa,stroke:#00838f,stroke-width:2px,color:#004d5b
    classDef purple fill:#f3e8ff,stroke:#7c3aed,stroke-width:2px,color:#4c1d95

    class A,B,D,E,G,H,J,K green
    class S,T,U red
    class I,Q blue
    class F,M,O amber
    class P dark
    class L,N,R teal
    class C purple

    linkStyle 6 stroke:#b42318,stroke-width:2px
    linkStyle 14 stroke:#b42318,stroke-width:2px
    linkStyle 18 stroke:#b42318,stroke-width:2px
    linkStyle 5 stroke:#1f6f43,stroke-width:3px
    linkStyle 2 stroke:#7c3aed,stroke-width:2px

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sequenceDiagram
    autonumber
    box rgb(220,237,200) Client
        actor U as User
        participant App as Mobile App
    end
    box rgb(187,222,251) Gateway
        participant GW as API Gateway
        participant Cache as Cache Layer
        participant Auth as Auth Service
    end
    box rgb(243,229,245) Services
        participant Orders as Order Service
        participant Inventory as Inventory Service
        participant Notify as Notify Service
    end
    U->>App: Tap checkout
    App->>GW: POST /checkout
    opt check cache first
        GW->>+Cache: GET cart session
        Cache-->>-GW: 200 cached cart data
    end
    GW->>+Auth: Validate JWT token
    Note over GW,Auth: RS256 signed JWT
    alt token valid
        Auth-->>GW: 200 claims and user_id
    else token expired
        Auth-->>GW: 401 Unauthorized
        GW-->>App: 401 session expired
        App->>U: Redirect to login
    end
    Auth-->>-GW: auth complete
    loop retry up to 3 times on 503
        GW->>+Inventory: GET /inventory/check
        Inventory-->>-GW: 200 stock confirmed
    end
    par fan-out to backend services
        GW->>+Orders: POST /orders
    and
        GW->>+Notify: POST /notify/pending
    end
    Orders-->>-GW: 201 order_id
    Notify-->>-GW: 202 queued
    Note over Orders,Notify: async processing
    Note over GW: aggregate responses
    GW-->>App: 201 Created order_id
    App->>U: Show order confirmation

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stateDiagram-v2
direction LR

[*] --> OrderReceived : customer submits
OrderReceived --> Validation : process order

state Validation {
    [*] --> AddressCheck
    AddressCheck --> PaymentVerify
    PaymentVerify --> FraudCheck
    FraudCheck --> [*]
}
note right of Validation : address fraud and payment checks
Validation --> ValidationGate

state ValidationGate <<choice>>
ValidationGate --> Cancelled : order invalid
ValidationGate --> ProcessingFork : order valid

Cancelled --> [*] : order cancelled

state ProcessingFork <<fork>>
ProcessingFork --> Warehouse
ProcessingFork --> Billing

state Warehouse {
    [*] --> InventoryCheck
    InventoryCheck --> Picking
    Picking --> Packing
    Packing --> [*]
}
note right of Warehouse : pick pack and ship readiness

state Billing {
    [*] --> ChargeCard
    ChargeCard --> SendReceipt
    SendReceipt --> [*]
}

Warehouse --> FulfillmentJoin
Billing --> FulfillmentJoin

state FulfillmentJoin <<join>>
FulfillmentJoin --> ShipmentChoice

state ShipmentChoice <<choice>>
ShipmentChoice --> ExpressShipping : express
ShipmentChoice --> StandardShipping : standard

state ExpressShipping {
    [*] --> CourierPickup
    CourierPickup --> InTransitExpress
    InTransitExpress --> [*]
}
state StandardShipping {
    [*] --> CarrierHandoff
    CarrierHandoff --> InTransitStandard
    InTransitStandard --> [*]
}

ExpressShipping --> DeliveryGate
StandardShipping --> DeliveryGate

state DeliveryGate <<join>>
DeliveryGate --> Delivered

note right of Delivered : carrier confirmation received
Delivered --> CustomerNotified : notify customer
CustomerNotified --> OrderClosed : feedback received
OrderClosed --> [*]

classDef process fill:#dbeafe,stroke:#2563eb,stroke-width:2px,color:#1e3a5f
classDef shipping fill:#ede9fe,stroke:#7c3aed,stroke-width:2px,color:#3b0764
classDef success fill:#dcfce7,stroke:#15803d,stroke-width:2px,color:#14532d
classDef terminal fill:#f0fdf4,stroke:#16a34a,stroke-width:2px,color:#14532d
classDef reject fill:#fee2e2,stroke:#dc2626,stroke-width:2px,color:#7f1d1d

class Validation,Warehouse,Billing process
class ExpressShipping,StandardShipping shipping
class Delivered,CustomerNotified success
class OrderClosed terminal
class Cancelled reject

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gantt
    title Cloud Migration Master Plan
    dateFormat  YYYY-MM-DD
    axisFormat %b %Y
    tickInterval 1month
    excludes weekends
    todayMarker off

    section Program Governance
    Charter approved :milestone,done,m0,2024-01-08,0d
    Steering committee formed :done,t1,2024-01-08,2024-01-19
    Risk register established :done,t2,2024-01-22,2024-02-02
    Budget approval :milestone,done,m1,2024-02-05,0d
    PMO onboarding :done,t3,2024-02-06,2024-02-23

    section Assessment and Design
    Current state inventory :done,t4,2024-01-15,2024-02-09
    Dependency mapping :done,t5,2024-02-12,2024-03-01
    Target architecture design :done,t6,2024-02-19,2024-03-15
    Architecture review board sign-off :milestone,done,m2,2024-03-18,0d
    Migration runbooks created :done,t7,2024-03-19,2024-04-05

    section Foundation Infrastructure
    Landing zone provisioned :done,t8,2024-03-04,2024-03-22
    Identity federation configured :done,t9,2024-03-25,2024-04-12
    Network topology deployed :done,t10,2024-04-01,2024-04-19
    Monitoring and alerting live :done,t11,2024-04-15,2024-04-30
    Foundation complete :milestone,done,m3,2024-05-01,0d

    section Wave 1 Workloads
    Lift-and-shift batch jobs :crit,t12,2024-05-06,2024-05-31
    Replatform dev environments :t13,2024-05-06,2024-05-24
    Validate Wave 1 workloads :crit,t14,2024-06-03,2024-06-14
    Wave 1 go-live :milestone,crit,m4,2024-06-17,0d

    section Wave 2 Workloads - Critical Path
    Database tier migration :active,crit,t15,2024-06-03,2024-07-12
    Application server migration :active,crit,t16,2024-06-17,2024-08-02
    Message bus migration :active,t17,2024-07-01,2024-07-26
    Cache layer migration :active,t18,2024-07-15,2024-08-09
    Wave 2 integration tests :crit,t19,2024-08-12,2024-09-06
    Wave 2 performance test :crit,t20,2024-08-26,2024-09-13
    Wave 2 go-live :milestone,crit,m5,2024-09-16,0d

    section Security and Compliance
    Penetration testing :crit,t21,2024-08-05,2024-08-30
    SOC2 audit preparation :t22,2024-08-19,2024-09-13
    Compliance sign-off :milestone,crit,m6,2024-09-23,0d
    Legacy decommission :crit,t23,2024-09-24,2024-10-18

    section Program Close
    Hypercare support period :t24,2024-10-21,2024-11-15
    Lessons learned workshop :t25,2024-11-04,2024-11-15
    Final handover to ops :milestone,crit,m7,2024-11-18,0d

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mindmap
  root((Cloud Platform))
    [Compute]
      (Kubernetes)
        [Pods]
        [Services]
        (Helm Charts)
      (Serverless)
        [Functions]
        [Triggers]
      [Virtual Machines]
    [Networking]
      (Load Balancer)
      (CDN)
      {{DNS}}
      (VPN)
    [Storage]
      ((Object Store))
        [Hot Tier]
        [Cold Tier]
      [Block Storage]
      (File System)
    [Security]
      {{IAM}}
        [Roles]
        [Policies]
        (MFA)
      (WAF)
      [SIEM]
    [Observability]
      (Metrics)
        [Dashboards]
        [Alerts]
      [Logs]
        (Log Search)
        (Retention)
      (Traces)
    [Data]
      ((Data Warehouse))
      [Stream Processor]
      (ETL Pipeline)
      {{Cache Layer}}
        [Hot Cache]
        [Warm Cache]

%%{init: {"theme": "forest"}}%%
timeline
    title The Evolution of Human Communication
    section Prehistoric Era
        70000BC : Cave paintings begin
        3500BC : Cuneiform writing invented
        1500BC : Phoenician alphabet
        600BC : Greek writing system refined
    section Classical Antiquity
        59BC : Roman newspaper Acta Diurna
        105AD : Paper invented in China
        400AD : Codex replaces scroll
        600AD : Block printing in China
    section Medieval Period
        868 : Diamond Sutra printed
        1040 : Movable type in China
        1215 : Magna Carta manuscript
        1450 : Gutenberg printing press
    section Age of Print
        1605 : First newspaper published
        1660 : Royal Society scientific journal
        1775 : Colonial postal service
        1837 : Morse telegraph invented
    section Industrial Age
        1876 : Bell patents telephone
        1895 : Marconi wireless radio
        1920 : First radio broadcast
        1939 : Television broadcasting begins
    section Digital Dawn
        1969 : ARPANET first packet
        1983 : Internet protocols established
        1991 : World Wide Web launched
        1995 : Amazon and eBay founded
    section Connected World
        2004 : Facebook social network
        2006 : Twitter microblogging
        2012 : Smartphones reach one billion users
        2020 : Video calls become daily life