docs: convert standard diagrams from draw.io PNGs to inline Mermaid

Gitea renders mermaid inline, so the flow/state/hierarchy/DAG diagrams
move to text-in-markdown: auto-layout (removes the manual overlap-prone
draw.io step), diffable source, no committed binaries, and a dark-text
theme so labels stay legible. Keep draw.io PNGs only for the two complex
bespoke diagrams (logical architecture, env2 topology) where pixel
control still wins. All 24 mermaid blocks validated by rendering.
This commit is contained in:
Joseph Doherty
2026-06-01 00:23:00 -04:00
parent e3ca5ac0cf
commit 43228185b4
65 changed files with 848 additions and 2145 deletions
@@ -39,8 +39,43 @@ Both endpoints use the same `Protocol`. EF Core migration renames `Configuration
The `DataConnectionActor` Reconnecting state is extended:
![primary-backup-failover-state-machine](diagrams/primary-backup-failover-state-machine.png)
<!-- source: diagrams/primary-backup-failover-state-machine.drawio — edit, then re-export with export-drawio.sh -->
```mermaid
%%{init: {'theme':'base', 'themeVariables': {'textColor':'#111111','lineColor':'#555555','edgeLabelBackground':'#ffffff','fontSize':'15px'}}}%%
flowchart TD
C(["Connected"])
BQ["Push bad quality<br/>to all subscribers"]
RT["Retry active endpoint<br/>(5s interval)"]
INC["_consecutiveFailures++"]
BR{"Evaluate<br/>_consecutiveFailures"}
SAME["Retry same endpoint"]
FO["Failover<br/>- dispose adapter, switch _activeEndpoint, reset counter<br/>- create fresh adapter with other config<br/>- attempt connect"]
NB["Keep retrying indefinitely<br/>(current behavior)"]
RC(["On successful reconnect (either endpoint)<br/>1. Reset _consecutiveFailures = 0<br/>2. ReSubscribeAll() — re-create subscriptions on new adapter<br/>3. Transition to Connected<br/>4. Log failover event if endpoint changed<br/>5. Report active endpoint in health metrics"])
C -->|"disconnect detected"| BQ
BQ --> RT
RT -->|"failure"| INC
INC --> BR
BR -->|"&lt; FailoverRetryCount"| SAME
SAME -.->|"retry"| RT
BR -->|"&gt;= FailoverRetryCount AND backup exists"| FO
BR -->|"&gt;= FailoverRetryCount AND no backup"| NB
NB -.->|"retry (round-robin n/a)"| RT
FO -->|"connect succeeds"| RC
FO -.->|"connect fails (round-robin: primary to backup to primary...)"| RT
RC -->|"Transition to Connected"| C
classDef start fill:#d5e8d4,stroke:#82b366,color:#111111;
classDef proc fill:#dae8fc,stroke:#6c8ebf,color:#111111;
classDef dec fill:#fff2cc,stroke:#d6b656,color:#111111;
classDef warn fill:#ffe6cc,stroke:#d79b00,color:#111111;
classDef bad fill:#f8cecc,stroke:#b85450,color:#111111;
class C,RC start
class BQ,RT,SAME proc
class INC,BR dec
class FO warn
class NB bad
```
**On successful reconnect (either endpoint):**
1. Reset `_consecutiveFailures = 0`
@@ -32,8 +32,46 @@ We want a strongly-typed model for OPC UA endpoint configuration, a validator th
## Architecture
![opcua-config-model-architecture](diagrams/opcua-config-model-architecture.png)
<!-- source: diagrams/opcua-config-model-architecture.drawio — edit, then re-export with export-drawio.sh -->
```mermaid
%%{init: {'theme':'base', 'themeVariables': {'textColor':'#111111','lineColor':'#555555','edgeLabelBackground':'#ffffff','fontSize':'15px'}}}%%
flowchart TD
subgraph COMMONS["ZB.MOM.WW.ScadaBridge.Commons"]
TYPES["Types/DataConnections/<br/>OpcUaEndpointConfig.cs (POCO)<br/>OpcUaHeartbeatConfig.cs (POCO)<br/>OpcUaSecurityMode.cs (enum)"]
VALID["Validators/<br/>OpcUaEndpointConfigValidator.cs"]
SER["Serialization/<br/>OpcUaEndpointConfigSerializer.cs"]
TYPES ~~~ VALID ~~~ SER
end
subgraph CENTRALUI["ZB.MOM.WW.ScadaBridge.CentralUI"]
CUIFORMS["Components/Forms/<br/>OpcUaEndpointEditor.razor (shared)"]
CUIPAGES["Pages/Admin/<br/>DataConnectionForm.razor"]
CUIFORMS ~~~ CUIPAGES
end
subgraph SITERUNTIME["ZB.MOM.WW.ScadaBridge.SiteRuntime"]
SRACTORS["Actors/<br/>DeploymentManagerActor<br/>(passes raw JSON to DataConnectionFactory)"]
SRDC["DataConnections.OpcUa/<br/>OpcUaDataConnection.cs<br/>(consumes typed model)"]
SRACTORS ~~~ SRDC
end
COMMONS -->|referenced by| CENTRALUI
COMMONS -->|referenced by| SITERUNTIME
NOTE["Both sides deserialize DataConnection.PrimaryConfiguration / BackupConfiguration<br/>into the same OpcUaEndpointConfig instance. The DB column type does not change."]
CENTRALUI -.- NOTE
SITERUNTIME -.- NOTE
classDef start fill:#d5e8d4,stroke:#82b366,color:#111111;
classDef proc fill:#dae8fc,stroke:#6c8ebf,color:#111111;
classDef dec fill:#fff2cc,stroke:#d6b656,color:#111111;
classDef warn fill:#ffe6cc,stroke:#d79b00,color:#111111;
classDef muted fill:#f5f5f5,stroke:#999999,color:#666666;
class COMMONS dec
class TYPES,VALID,SER warn
class CENTRALUI,CUIFORMS,CUIPAGES proc
class SITERUNTIME,SRACTORS,SRDC start
class NOTE muted
```
Both sides deserialize from `DataConnection.PrimaryConfiguration` / `BackupConfiguration` strings into the same `OpcUaEndpointConfig` instance. The DB column type does not change.
+38 -2
View File
@@ -14,8 +14,44 @@
## Task Dependency Graph
![env2-task-dependency-graph](diagrams/env2-task-dependency-graph.png)
<!-- source: diagrams/env2-task-dependency-graph.drawio — edit, then re-export with export-drawio.sh -->
```mermaid
%%{init: {'theme':'base', 'themeVariables': {'textColor':'#111111','lineColor':'#555555','edgeLabelBackground':'#ffffff','fontSize':'15px'}}}%%
flowchart LR
GRP["all independent, all parallelizable, all ready from the start"]
T0["T0"]
T1["T1"]
T2["T2"]
T3["T3"]
T4["T4"]
T6["T6"]
T7["T7"]
T8["T8"]
T9["T9"]
T5["T5<br/>lifecycle scripts"]
T10(["T10<br/>manual smoke test"])
NOTE["T10 is the only task that requires all of T0T9 done. Everything else runs in parallel."]
T0 --> T10
T1 --> T10
T2 --> T10
T3 --> T10
T6 --> T10
T7 --> T10
T8 --> T10
T9 --> T10
T0 --> T5
T4 --> T5
T5 --> T10
classDef start fill:#d5e8d4,stroke:#82b366,color:#111111;
classDef proc fill:#dae8fc,stroke:#6c8ebf,color:#111111;
classDef warn fill:#ffe6cc,stroke:#d79b00,color:#111111;
classDef muted fill:#f5f5f5,stroke:#999999,color:#666666;
class T0,T1,T2,T3,T4,T6,T7,T8,T9 proc
class T5 warn
class T10 start
class GRP,NOTE muted
```
T10 is the only task that requires all of T0T9 done. Everything else can run in parallel.
@@ -18,8 +18,33 @@
## Section 1 — Architecture
![opcua-tag-browser-architecture](diagrams/opcua-tag-browser-architecture.png)
<!-- source: diagrams/opcua-tag-browser-architecture.drawio — edit, then re-export with export-drawio.sh -->
```mermaid
%%{init: {'theme':'base', 'themeVariables': {'textColor':'#111111','lineColor':'#555555','edgeLabelBackground':'#ffffff','fontSize':'15px'}}}%%
flowchart TD
N1["Blazor Server browser"]
N2["CentralUI: InstanceConfigure.razor"]
N3["CentralUI: OpcUaBrowserDialog component"]
N4["CentralUI: IOpcUaBrowseService"]
N5["CommunicationService.SendCommandToSiteAsync of BrowseOpcUaNodeResult (siteId, BrowseOpcUaNodeCommand)"]
N6["Site: CentralCommunicationActor → DataConnectionManagerActor"]
N7["OPC UA server"]
N1 -->|SignalR| N2
N2 -->|opens| N3
N3 -->|uses| N4
N4 -->|implementation calls| N5
N5 -->|"ClusterClient Ask<br/>ManagementEnvelope { User, Command, CorrelationId }"| N6
N6 -->|"dispatches to IBrowsableDataConnection (RealOpcUaClient)<br/>OPC Foundation .NET SDK Browse service"| N7
classDef start fill:#d5e8d4,stroke:#82b366,color:#111111;
classDef proc fill:#dae8fc,stroke:#6c8ebf,color:#111111;
classDef warn fill:#ffe6cc,stroke:#d79b00,color:#111111;
classDef alt fill:#e1d5e7,stroke:#9673a6,color:#111111;
class N1,N2,N3,N4 proc
class N5 alt
class N6 start
class N7 warn
```
Three slices, top-to-bottom:
1. **Data model.** Add a per-instance OPC UA address override (new column on `InstanceConnectionBinding`).
@@ -145,8 +170,48 @@ Returning failure inside `BrowseOpcUaNodeResult` (rather than exceptions across
**Wire flow.**
![opcua-tag-browser-command-flow](diagrams/opcua-tag-browser-command-flow.png)
<!-- source: diagrams/opcua-tag-browser-command-flow.drawio — edit, then re-export with export-drawio.sh -->
```mermaid
%%{init: {'theme':'base', 'themeVariables': {'textColor':'#111111','lineColor':'#555555','edgeLabelBackground':'#ffffff','fontSize':'15px'}}}%%
flowchart TD
S1["CentralUI.OpcUaBrowseService.BrowseChildrenAsync(siteId, connId, parent)"]
S2["CommunicationService.SendCommandToSiteAsync of BrowseOpcUaNodeResult (siteId, new BrowseOpcUaNodeCommand(connId, parent))"]
S3["ManagementEnvelope { User, Command, CorrelationId }<br/>over ClusterClient"]
S4["Site: CentralCommunicationActor unwraps envelope"]
S5["Site: DataConnectionManagerActor receives BrowseOpcUaNodeCommand<br/>(DCL coordinator actor — owns the per-connection IDataConnection instances)"]
S1 --> S2 --> S3 --> S4 --> S5
subgraph HANDLER["Handler logic"]
direction TB
HL["Look up IDataConnection by Id"]
HNF["if not found → ConnectionNotFound"]
HNB["if not (conn is IBrowsableDataConnection) → NotBrowsable"]
HAW["else await conn.BrowseChildrenAsync(ParentNodeId, ct)"]
HNC["Catch ConnectionNotConnectedException → ConnectionNotConnected"]
HCN["Catch OperationCanceledException → Timeout"]
HSVC["Catch ServiceResultException → ServerError + verbatim msg"]
HSUC["Else success: BrowseOpcUaNodeResult(children, truncated, null)"]
HL --- HNF --- HNB --- HAW --- HNC --- HCN --- HSVC --- HSUC
end
S5 -->|processes| HANDLER
R1["Reply travels back via<br/>CentralCommunicationActor → CommunicationService"]
R2["returned to CentralUI page"]
HANDLER -->|result / failure| R1
R1 --> R2
classDef start fill:#d5e8d4,stroke:#82b366,color:#111111;
classDef proc fill:#dae8fc,stroke:#6c8ebf,color:#111111;
classDef dec fill:#fff2cc,stroke:#d6b656,color:#111111;
classDef bad fill:#f8cecc,stroke:#b85450,color:#111111;
classDef alt fill:#e1d5e7,stroke:#9673a6,color:#111111;
class S1,R1,R2 proc
class S2,S3 alt
class S4,S5,HSUC start
class HANDLER,HL,HAW dec
class HNF,HNB,HNC,HCN,HSVC bad
```
Handler lives in the **DCL coordinator actor** (the same actor that owns the per-connection `IDataConnection` instances) — keeps lifecycle and browse co-located so we don't race against reconnect.
+81 -2
View File
@@ -16,8 +16,87 @@
## Task dependency overview
![native-alarms-task-dependency](diagrams/native-alarms-task-dependency.png)
<!-- source: diagrams/native-alarms-task-dependency.drawio — edit, then re-export with export-drawio.sh -->
```mermaid
%%{init: {'theme':'base', 'themeVariables': {'textColor':'#111111','lineColor':'#555555','edgeLabelBackground':'#ffffff','fontSize':'15px'}}}%%
flowchart LR
T1["T1"]
T3["T3"]
T2["T2"]
T10["T10<br/>DCL actor"]
T11["T11<br/>OPC UA adapter"]
T12["T12<br/>MxGateway adapter"]
T17["T17<br/>computed AlarmActor enrich"]
T18["T18<br/>proto"]
T19["T19<br/>grpc mapping"]
T23["T23<br/>DebugView"]
T4["T4"]
T5["T5"]
T6["T6"]
T7["T7<br/>migration"]
T8["T8"]
T9["T9<br/>validation"]
T20["T20"]
T21["T21<br/>mgmt handlers"]
T26["T26<br/>seed"]
T22["T22<br/>CLI"]
T24["T24<br/>template UI"]
T25["T25<br/>instance UI"]
T13["T13"]
T14["T14"]
T15["T15<br/>NativeAlarmActor"]
T16["T16<br/>InstanceActor wiring"]
T15IN["inputs to T15:<br/>T1, T2, T3, T4 (Resolved), T13, T14"]
T27["T27<br/>docs"]
T28["T28<br/>integration / manual verify"]
EVT["(everything) emits to T27 and T28"]
T1 --> T2
T1 --> T10
T1 --> T11
T1 --> T12
T3 --> T2
T3 --> T10
T3 --> T11
T3 --> T12
T2 --> T17
T2 --> T18
T18 --> T19
T19 --> T23
T4 --> T5
T4 --> T7
T4 --> T8
T4 --> T20
T5 --> T6
T6 --> T21
T8 --> T9
T20 --> T21
T20 --> T22
T20 --> T24
T20 --> T25
T21 --> T26
T13 --> T15
T14 --> T15
T15 --> T16
classDef start fill:#d5e8d4,stroke:#82b366,color:#111111;
classDef proc fill:#dae8fc,stroke:#6c8ebf,color:#111111;
classDef dec fill:#fff2cc,stroke:#d6b656,color:#111111;
classDef warn fill:#ffe6cc,stroke:#d79b00,color:#111111;
classDef alt fill:#e1d5e7,stroke:#9673a6,color:#111111;
classDef muted fill:#f5f5f5,stroke:#999999,color:#666666;
class T1,T2,T3,T10,T11,T12 proc
class T17,T18,T19,T23 alt
class T4,T5,T6,T7,T8,T9,T20,T21,T22,T24,T25,T26 start
class T13,T14 dec
class T15,T16 warn
class T27,T28,T15IN,EVT muted
```
---
@@ -1,98 +0,0 @@
<mxfile host="app.diagrams.net">
<diagram id="env2dag" name="Env2 Task Dependency Graph">
<mxGraphModel dx="1200" dy="900" grid="1" gridSize="10" guides="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="1000" pageHeight="800" math="0" shadow="0">
<root>
<mxCell id="0" />
<mxCell id="1" parent="0" />
<!-- Independent / parallelizable group label -->
<mxCell id="grpLabel" value="all independent, all parallelizable, all ready from the start" style="text;html=1;align=center;verticalAlign=middle;fontStyle=2;fontColor=#666666;" vertex="1" parent="1">
<mxGeometry x="40" y="30" width="300" height="30" as="geometry" />
</mxCell>
<!-- Independent task nodes (T0..T9 minus T5) -->
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<mxCell id="t7" value="T7" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontStyle=1;" vertex="1" parent="1">
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<mxGeometry x="80" y="480" width="80" height="40" as="geometry" />
</mxCell>
<!-- T5: lifecycle scripts (fed by T0 and T4) -->
<mxCell id="t5" value="T5&#10;lifecycle scripts" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#ffe6cc;strokeColor=#d79b00;fontStyle=1;" vertex="1" parent="1">
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<!-- T10: manual smoke test -->
<mxCell id="t10" value="T10&#10;manual smoke test" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;fontStyle=1;" vertex="1" parent="1">
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<!-- Edges: each independent task -> T10 -->
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<mxCell id="e7" style="edgeStyle=orthogonalEdgeStyle;rounded=0;html=1;endArrow=block;strokeColor=#6c8ebf;exitX=1;exitY=0.5;exitDx=0;exitDy=0;" edge="1" parent="1" source="t7" target="t10">
<mxGeometry relative="1" as="geometry" />
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<mxCell id="e8" style="edgeStyle=orthogonalEdgeStyle;rounded=0;html=1;endArrow=block;strokeColor=#6c8ebf;exitX=1;exitY=0.5;exitDx=0;exitDy=0;" edge="1" parent="1" source="t8" target="t10">
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<!-- T0,T4 -> T5 -->
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<!-- T5 -> T10 -->
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</mxCell>
<!-- Note -->
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vertex="1" parent="1">
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</mxCell>
<mxCell id="h_success" value="Else success: BrowseOpcUaNodeResult(children, truncated, null)"
style="rounded=0;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;fontSize=11;align=left;spacingLeft=8;"
vertex="1" parent="1">
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</mxCell>
<!-- auth note -->
<mxCell id="authnote" value="Auth: site-side handler validates ManagementEnvelope.User has the Design role;&#10;otherwise reply ServerError (&quot;Not authorized to browse data connections&quot;)."
style="text;html=1;align=left;verticalAlign=middle;fontSize=11;fontStyle=2;fontColor=#555555;"
vertex="1" parent="1">
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<!-- Reply path -->
<mxCell id="r1" value="Reply travels back via&#10;CentralCommunicationActor &#8594; CommunicationService"
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vertex="1" parent="1">
<mxGeometry x="120" y="900" width="440" height="60" as="geometry" />
</mxCell>
<mxCell id="r2" value="returned to CentralUI page"
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vertex="1" parent="1">
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<mxGeometry relative="1" as="geometry" />
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edge="1" parent="1" source="s4" target="s5">
<mxGeometry relative="1" as="geometry" />
</mxCell>
<!-- s5 -> handler logic -->
<mxCell id="e5" value="processes"
style="edgeStyle=orthogonalEdgeStyle;rounded=0;html=1;endArrow=block;fontSize=11;"
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<mxGeometry relative="1" as="geometry" />
</mxCell>
<!-- handler -> reply -->
<mxCell id="e6" value="result / failure"
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<mxfile host="app.diagrams.net">
<diagram id="failover" name="Failover State Machine">
<mxGraphModel dx="1200" dy="900" grid="1" gridSize="10" guides="1" arrows="1"
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<root>
<mxCell id="0" />
<mxCell id="1" parent="0" />
<!-- Connected (start state) -->
<mxCell id="connected" value="Connected"
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</mxCell>
<!-- Push bad quality -->
<mxCell id="badquality" value="Push bad quality&#10;to all subscribers"
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<!-- Retry active endpoint -->
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<mxCell id="incr" value="_consecutiveFailures++"
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<mxCell id="same" value="Retry same endpoint"
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+21 -2
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@@ -547,8 +547,27 @@ This section governs how implementation plans are executed. The goal is autonomo
For each work package, follow this sequence:
![generate-plans-per-work-package](diagrams/generate-plans-per-work-package.png)
<!-- source: diagrams/generate-plans-per-work-package.drawio — edit, then re-export with export-drawio.sh -->
```mermaid
%%{init: {'theme':'base', 'themeVariables': {'textColor':'#111111','lineColor':'#555555','edgeLabelBackground':'#ffffff','fontSize':'15px'}}}%%
flowchart TD
S1["1. READ the WP description and acceptance criteria"]
S2["2. READ all traced requirements (HLR bullets, KDD, CD constraints) to understand intent"]
S3["3. IMPLEMENT the WP<br/>• Write code<br/>• Write unit tests for acceptance criteria<br/>• Write negative tests for prohibition criteria"]
S4["4. VERIFY acceptance criteria<br/>• Run tests: all must pass<br/>• Walk each acceptance criterion line by line<br/>• If a criterion cannot be verified yet (depends on a later WP), note it as deferred to WP-N"]
S5["5. UPDATE the phase execution checklist<br/>• Mark WP as complete with date<br/>• Note any deferred criteria<br/>• Note any questions logged"]
S6["6. COMMIT with message:<br/>Phase N WP-M: summary"]
S1 --> S2 --> S3 --> S4 --> S5 --> S6
classDef start fill:#d5e8d4,stroke:#82b366,color:#111111;
classDef proc fill:#dae8fc,stroke:#6c8ebf,color:#111111;
classDef dec fill:#fff2cc,stroke:#d6b656,color:#111111;
classDef warn fill:#ffe6cc,stroke:#d79b00,color:#111111;
class S1,S2 proc
class S3 start
class S4,S5 dec
class S6 warn
```
### Mid-Phase Compliance Check
+77 -6
View File
@@ -23,8 +23,39 @@ gRPC server-streaming is an established pattern for real-time tag value updates;
## Architecture
![grpc-streams-architecture](diagrams/grpc-streams-architecture.png)
<!-- source: diagrams/grpc-streams-architecture.drawio — edit, then re-export with export-drawio.sh -->
```mermaid
%%{init: {'theme':'base', 'themeVariables': {'textColor':'#111111','lineColor':'#555555','edgeLabelBackground':'#ffffff','fontSize':'15px'}}}%%
flowchart TD
subgraph CENTRAL["Central Cluster"]
BT["DebugStreamBridgeActor"]
GC["SiteStreamGrpcClient<br/>(per-site, on central)"]
BB["DebugStreamBridgeActor"]
SR(["SignalR Hub / Blazor UI"])
end
subgraph SITE["Site Cluster"]
IN["InstanceActor"]
PB{"publishes<br/>AttributeValueChanged<br/>AlarmStateChanged"}
GS["SiteStreamGrpcServer<br/>(Kestrel, on site)"]
end
BT -.->|"SubscribeDebugView"| IN
IN -.->|"DebugViewSnapshot"| BT
IN --> PB
PB --> GS
GS -->|"gRPC stream (HTTP/2)"| GC
GC --> BB
BB --> SR
classDef start fill:#d5e8d4,stroke:#82b366,color:#111111;
classDef proc fill:#dae8fc,stroke:#6c8ebf,color:#111111;
classDef dec fill:#fff2cc,stroke:#d6b656,color:#111111;
classDef warn fill:#ffe6cc,stroke:#d79b00,color:#111111;
class BT,GC,BB proc
class SR start
class IN,GS warn
class PB dec
```
**Key separation**: ClusterClient handles subscribe/unsubscribe/snapshot (request-response). gRPC handles the ongoing value stream (server-streaming).
@@ -250,8 +281,23 @@ public override async Task SubscribeInstance(
`IServerStreamWriter<T>` is **not thread-safe**. Multiple Akka actors may publish events concurrently. The `Channel<SiteStreamEvent>` bridges these worlds:
![grpc-channel-bridging](diagrams/grpc-channel-bridging.png)
<!-- source: diagrams/grpc-channel-bridging.drawio — edit, then re-export with export-drawio.sh -->
```mermaid
%%{init: {'theme':'base', 'themeVariables': {'textColor':'#111111','lineColor':'#555555','edgeLabelBackground':'#ffffff','fontSize':'15px'}}}%%
flowchart TD
AKKA["Akka Actor Thread(s)"]
CH(["Channel&lt;SiteStreamEvent&gt;<br/><br/>BoundedChannelOptions(1000)<br/>FullMode = DropOldest"])
GRPC["gRPC Response Stream"]
AKKA -->|"channel.Writer.TryWrite(evt)"| CH
CH -->|"await responseStream.WriteAsync(evt)"| GRPC
classDef start fill:#d5e8d4,stroke:#82b366,color:#111111;
classDef proc fill:#dae8fc,stroke:#6c8ebf,color:#111111;
classDef warn fill:#ffe6cc,stroke:#d79b00,color:#111111;
class AKKA warn
class CH start
class GRPC proc
```
- **Bounded capacity** (1000): prevents unbounded memory growth if the gRPC client is slow
- **DropOldest**: matches the existing `SiteStreamManager` overflow strategy
@@ -401,8 +447,33 @@ private void HandleGrpcStreamError(Exception ex)
### Reconnection State Machine (DebugStreamBridgeActor)
![grpc-reconnection-state-machine](diagrams/grpc-reconnection-state-machine.png)
<!-- source: diagrams/grpc-reconnection-state-machine.drawio — edit, then re-export with export-drawio.sh -->
```mermaid
%%{init: {'theme':'base', 'themeVariables': {'textColor':'#111111','lineColor':'#555555','edgeLabelBackground':'#ffffff','fontSize':'15px'}}}%%
flowchart TD
S(["Streaming<br/><i>Normal state: gRPC stream active</i>"])
R(["Reconnecting<br/><i>try other node endpoint</i>"])
D{"reconnect result?"}
RT["schedule retry<br/>(5s backoff)"]
T(["Terminated<br/><i>notify consumer, stop actor</i>"])
S -->|"gRPC stream error / keepalive timeout"| R
R --> D
D -->|"success"| S
D -->|"failure (retry &lt; max)"| RT
RT --> R
D -->|"failure (retry &gt;= max)"| T
classDef start fill:#d5e8d4,stroke:#82b366,color:#111111;
classDef proc fill:#dae8fc,stroke:#6c8ebf,color:#111111;
classDef dec fill:#fff2cc,stroke:#d6b656,color:#111111;
classDef warn fill:#ffe6cc,stroke:#d79b00,color:#111111;
classDef bad fill:#f8cecc,stroke:#b85450,color:#111111;
class S start
class R dec
class D proc
class RT warn
class T bad
```
### Summary