Add System.Diagnostics.Metrics for per-connection Zebus monitoring via net10.0 multi-targeting by Copilot · Pull Request #120 · Abc-Arbitrage/Zebus

Copilot · 2026-04-24T13:54:44Z

Adds System.Diagnostics.Metrics instrumentation to monitor Zebus connection state and messaging, gated behind #if NET10_0_OR_GREATER with no new NuGet dependencies.

Metrics

All per-connection metrics are tagged with zebus.peer.id for individual peer filtering:

Metric	Type	Description
`zebus.transport.messages.sent`	Counter (per-peer)	Messages sent
`zebus.transport.messages.received`	Counter (per-peer)	Messages received
`zebus.transport.bytes.sent`	Counter (per-peer)	Bytes sent
`zebus.transport.bytes.received`	Counter (per-peer)	Bytes received
`zebus.transport.messages.send_failures`	Counter (per-peer)	Send failures
`zebus.transport.peer_connections`	Counter (per-peer)	Socket connects
`zebus.transport.peer_disconnections`	Counter (per-peer)	Socket disconnects
`zebus.transport.peer_connection_failures`	Counter (per-peer)	Connect failures
`zebus.transport.connection.alive`	ObservableGauge (per-peer)	1=alive, 0=dead
`zebus.transport.outbound_sockets`	UpDownCounter	Active socket count
`zebus.directory.known_peers`	UpDownCounter	Known peer count
`zebus.directory.peer_updates`	Counter	Peer update events

// Meter name: "Abc.Zebus"
// Example: filter messages sent to a specific peer
// dotnet-counters monitor --counters "Abc.Zebus[zebus.peer.id=MyPeer.0]"

Metric class organization

Instruments are split into dedicated classes per service:

ZebusMetrics — shared Meter instance and PeerTag helper
TransportMetrics — transport-layer instruments (messages, bytes, connections, sockets)
DirectoryMetrics — directory-layer instruments (known peers, peer updates)

Multi-targeting

Abc.Zebus.csproj targets netstandard2.0;net10.0
Metrics code is entirely behind #if NET10_0_OR_GREATER; netstandard2.0 output is unchanged

.NET 10 compatibility fixes

Polyfill types that now exist in the BCL needed conditional compilation:

NullableAnnotations, IsExternalInit, SkipLocalsInitAttribute — wrapped in #if !NETCOREAPP
ExtendDictionary.GetValueOrDefault / ExtendIEnumerable.ToHashSet — excluded on NETCOREAPP to resolve ambiguities with BCL extension methods
ProtoBufConvert — FormatterServices.GetUninitializedObject → RuntimeHelpers.GetUninitializedObject
MessageId — RNGCryptoServiceProvider → RandomNumberGenerator.Fill
MessageProcessingException / DomainException — serialization constructors excluded on NETCOREAPP (SYSLIB0051)
ProtoBufferReader.TryReadGuid — fixed definite assignment of out parameter
BindingKey — replaced extension method call with explicit TryGetValue to avoid ambiguity

…strumentation Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/8f197dc4-0b8b-4ce0-a40d-97ea7c647727 Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

… alive/dead status Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/8f197dc4-0b8b-4ce0-a40d-97ea7c647727 Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

…nsistency Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/8f197dc4-0b8b-4ce0-a40d-97ea7c647727 Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Kuinox · 2026-04-28T18:02:21Z

@copilot we may have multiple bus at the same time, having a active bus count metrics isn't very useful, but, we will want to track per bus instance.
You can do a static interlocked increment starting at 0 on the instance to get a stable id.

Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/ca085f25-a9b5-488a-ad33-858646b84131 Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Copilot · 2026-04-28T18:06:10Z

@copilot we may have multiple bus at the same time, having a active bus count metrics isn't very useful, but, we will want to track per bus instance.
You can do a static interlocked increment startin...

Done in e04af38. Bus now has a static _nextInstanceId incremented via Interlocked.Increment, and the zebus.bus.active UpDownCounter is tagged with zebus.bus.id per instance instead of being a global aggregate.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

REDACTED-bastard
- Triggering command: /usr/share/dotnet/dotnet /usr/share/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.runtimeconfig.json --depsfile /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.deps.json /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/testhost.dll --port 35909 --endpoint 127.0.0.1:035909 --role client --parentprocessid 5536 --telemetryoptedin false (dns block)
non-existing-peer
- Triggering command: /usr/share/dotnet/dotnet /usr/share/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.runtimeconfig.json --depsfile /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.deps.json /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/testhost.dll --port 35909 --endpoint 127.0.0.1:035909 --role client --parentprocessid 5536 --telemetryoptedin false (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Kuinox

@copilot

Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/efc82941-92e3-4ee8-b641-de8cf4c1f8ec Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Copilot · 2026-04-28T18:25:16Z

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

REDACTED-bastard
- Triggering command: /usr/share/dotnet/dotnet /usr/share/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.runtimeconfig.json --depsfile /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.deps.json /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/testhost.dll --port 43095 --endpoint 127.0.0.1:043095 --role client --parentprocessid 5517 --telemetryoptedin false (dns block)
non-existing-peer
- Triggering command: /usr/share/dotnet/dotnet /usr/share/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.runtimeconfig.json --depsfile /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.deps.json /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/testhost.dll --port 43095 --endpoint 127.0.0.1:043095 --role client --parentprocessid 5517 --telemetryoptedin false (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Kuinox

Is there a latency on the heartbeat, or other means to measure latency ? It could be cool to add a latency metric. @copilot

…ndard, removing #ifdef on usings Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/81a35d95-9277-416c-9f67-15fb83ff98cf Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Copilot · 2026-04-28T18:47:28Z

Is there a latency on the heartbeat, or other means to measure latency ? It could be cool to add a latency metric. @copilot

The directory has a PingPeerCommand handler that tracks TimeSinceLastPing via a Stopwatch, but it only measures elapsed time since the last ping was received — not round-trip latency. There's no built-in RTT measurement in the current transport or directory code that could be exposed as a latency metric without adding new protocol-level instrumentation. Want me to add one, or is that out of scope for this PR?

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

REDACTED-bastard
- Triggering command: /usr/share/dotnet/dotnet /usr/share/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.runtimeconfig.json --depsfile /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.deps.json /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/testhost.dll --port 41415 --endpoint 127.0.0.1:041415 --role client --parentprocessid 5105 --telemetryoptedin false (dns block)
non-existing-peer
- Triggering command: /usr/share/dotnet/dotnet /usr/share/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.runtimeconfig.json --depsfile /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.deps.json /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/testhost.dll --port 41415 --endpoint 127.0.0.1:041415 --role client --parentprocessid 5105 --telemetryoptedin false (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Kuinox · 2026-04-30T14:16:22Z

@copilot I also want a byte count per message metric.

Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/f0604d23-5c82-4f7f-baaa-b80b93aa52cf Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Copilot · 2026-04-30T14:20:31Z

@copilot I also want a byte count per message metric.

Added in 4dd924d. Two new counters: zebus.transport.bytes.sent and zebus.transport.bytes.received, both tagged with zebus.peer.id. Sent bytes use bufferWriter.Position, received bytes use bufferReader.Length.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

REDACTED-bastard
- Triggering command: /usr/share/dotnet/dotnet /usr/share/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.runtimeconfig.json --depsfile /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.deps.json /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/testhost.dll --port 37177 --endpoint 127.0.0.1:037177 --role client --parentprocessid 4414 --telemetryoptedin false (dns block)
non-existing-peer
- Triggering command: /usr/share/dotnet/dotnet /usr/share/dotnet/dotnet exec --runtimeconfig /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.runtimeconfig.json --depsfile /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/Abc.Zebus.Tests.deps.json /home/REDACTED/work/Zebus/Zebus/src/Abc.Zebus.Tests/bin/Debug/net9.0/testhost.dll --port 37177 --endpoint 127.0.0.1:037177 --role client --parentprocessid 4414 --telemetryoptedin false (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Copilot · 2026-08-18T09:45:30Z

@copilot The code is scattered with #if NET10_0_OR_GREATER. Make the metric APIs available for all target frameworks, and use #if NET inside the *Metrics classes. Basically, make the method no...

Done. The #if NET guards are now inside the *Metrics classes only. All call sites in ZmqTransport, ZmqOutboundSocket, and PeerDirectoryClient are unconditional — the methods are no-ops on netstandard2.0.

ltrzesniewski · 2026-08-18T09:52:41Z

@copilot Move all the remaining metric-related stuff to the Abc.Zebus.Monitoring namespace. ALso, fix the formatting in your last commit. I don't want to see any usage of System.Diagnostics.Metrics in the existing code. Make wrappers if necessary.

Co-authored-by: ltrzesniewski <7913492+ltrzesniewski@users.noreply.github.com>

Copilot · 2026-08-18T09:56:20Z

@copilot Move all the remaining metric-related stuff to the Abc.Zebus.Monitoring namespace. ALso, fix the formatting in your last commit. I don't want to see any usage of System.Diagnostics.Metrics...

Done. System.Diagnostics.Metrics types are now fully contained within the Abc.Zebus.Monitoring namespace. ObserveConnectionStates moved into TransportMetrics, ZmqTransport holds object? for the gauge reference. Formatting in ZmqOutboundSocket.cs fixed too.

ltrzesniewski · 2026-08-18T10:01:37Z

@copilot make a wrapper type for the gauge instead of object?. Also, fix the formatting.

Co-authored-by: ltrzesniewski <7913492+ltrzesniewski@users.noreply.github.com>

Copilot · 2026-08-18T10:03:50Z

@copilot make a wrapper type for the gauge instead of object?. Also, fix the formatting.

Done — ConnectionStateGauge is now a dedicated internal sealed class in TransportMetrics.cs (wrapping the ObservableGauge<int> under #if NET), replacing the object? field in ZmqTransport. Formatting fixed too.

ltrzesniewski · 2026-08-18T12:07:49Z

@copilot In PeerDirectoryClient, extract a method for calls to PeerUpdated?.Invoke and DirectoryMetrics.AddPeerUpdates, since those are always executed together

Co-authored-by: ltrzesniewski <7913492+ltrzesniewski@users.noreply.github.com>

…yClient Co-authored-by: ltrzesniewski <7913492+ltrzesniewski@users.noreply.github.com>

Copilot · 2026-08-18T12:11:03Z

@copilot In PeerDirectoryClient, extract a method for calls to PeerUpdated?.Invoke and DirectoryMetrics.AddPeerUpdates, since those are always executed together

Done — extracted RaisePeerUpdated(PeerId peerId, PeerUpdateAction action) in PeerDirectoryClient. All five call sites now use it.

ltrzesniewski · 2026-08-18T12:20:24Z

@ocoanet I'd like your opinion on this please, especially about the "static" aspect.

- Group connections by PeerIdTag - Use UpDownCounter instead of Gauge - Remove total connected sockets (it can be derived from connected sockets) - Use an observable metric with absolute values to ensure late-listeners receive updates

Copilot AI and others added 3 commits April 24, 2026 12:50

Add multi-targeting (netstandard2.0 + net10.0) and initial metrics in…

949a67e

…strumentation Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/8f197dc4-0b8b-4ce0-a40d-97ea7c647727 Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Add per-connection metrics with peer ID tags and observable gauge for…

950d97b

… alive/dead status Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/8f197dc4-0b8b-4ce0-a40d-97ea7c647727 Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Tag MessagesReceived metric with sender peer ID for per-connection co…

543866e

…nsistency Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/8f197dc4-0b8b-4ce0-a40d-97ea7c647727 Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Copilot AI assigned Copilot and Kuinox Apr 24, 2026

Copilot created this pull request from a session on behalf of Kuinox April 24, 2026 13:54

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Kuinox reviewed Apr 24, 2026

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Comment thread src/Abc.Zebus/Routing/BindingKey.cs

Copilot started work on behalf of Kuinox April 28, 2026 18:02

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Track bus metrics per instance using a stable Interlocked-incremented ID

e04af38

Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/ca085f25-a9b5-488a-ad33-858646b84131 Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Copilot finished work on behalf of Kuinox April 28, 2026 18:08

Copilot AI requested a review from Kuinox April 28, 2026 18:08

Kuinox requested changes Apr 28, 2026

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Comment thread src/Abc.Zebus/Core/Bus.cs Outdated

Comment thread src/Abc.Zebus/Monitoring/ZebusMetrics.cs Outdated

Comment thread src/Abc.Zebus/Transport/ZmqTransport.cs Outdated

Comment thread src/Abc.Zebus/MessageId.cs

Comment thread src/Abc.Zebus/MessageProcessingException.cs Outdated

Copilot started work on behalf of Kuinox April 28, 2026 18:16

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Copilot AI and others added 2 commits April 28, 2026 18:21

Split ZebusMetrics into per-service classes and remove bus active metric

e1e006b

Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/efc82941-92e3-4ee8-b641-de8cf4c1f8ec Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Remove trailing newlines from new metric files

4c7958d

Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/efc82941-92e3-4ee8-b641-de8cf4c1f8ec Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Copilot finished work on behalf of Kuinox April 28, 2026 18:25

Copilot AI requested a review from Kuinox April 28, 2026 18:25

Kuinox reviewed Apr 28, 2026

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Comment thread src/Abc.Zebus/Monitoring/TransportMetrics.cs Outdated

Comment thread src/Abc.Zebus/Transport/ZmqTransport.cs Outdated

Copilot started work on behalf of Kuinox April 28, 2026 18:42

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Restructure #ifdef so metric classes are declared but empty on netsta…

c3c154c

…ndard, removing #ifdef on usings Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/81a35d95-9277-416c-9f67-15fb83ff98cf Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Copilot finished work on behalf of Kuinox April 28, 2026 18:51

Copilot AI requested a review from Kuinox April 28, 2026 18:51

Copilot started work on behalf of Kuinox April 30, 2026 14:16

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Add byte count per message metrics (zebus.transport.bytes.sent/received)

4dd924d

Agent-Logs-Url: https://github.com/Abc-Arbitrage/Zebus/sessions/f0604d23-5c82-4f7f-baaa-b80b93aa52cf Co-authored-by: Kuinox <18743295+Kuinox@users.noreply.github.com>

Copilot finished work on behalf of ltrzesniewski August 18, 2026 09:46

Copilot started work on behalf of ltrzesniewski August 18, 2026 09:53

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Move all Metrics types into Monitoring namespace; fix formatting

61f531c

Co-authored-by: ltrzesniewski <7913492+ltrzesniewski@users.noreply.github.com>

Copilot finished work on behalf of ltrzesniewski August 18, 2026 09:56

Copilot started work on behalf of ltrzesniewski August 18, 2026 10:01

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Add ConnectionStateGauge wrapper type and fix ZmqTransport formatting

4d43fa6

Co-authored-by: ltrzesniewski <7913492+ltrzesniewski@users.noreply.github.com>

Copilot finished work on behalf of ltrzesniewski August 18, 2026 10:06

Copilot started work on behalf of ltrzesniewski August 18, 2026 12:08

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Copilot AI and others added 2 commits August 18, 2026 12:10

Extract RaisePeerUpdated helper in PeerDirectoryClient

f8d2dc3

Co-authored-by: ltrzesniewski <7913492+ltrzesniewski@users.noreply.github.com>

Restore missing if guard for PeerSubscriptionsUpdated in PeerDirector…

08dca49

…yClient Co-authored-by: ltrzesniewski <7913492+ltrzesniewski@users.noreply.github.com>

Copilot finished work on behalf of ltrzesniewski August 18, 2026 12:11

ltrzesniewski requested a review from ocoanet August 18, 2026 12:20

ltrzesniewski approved these changes Aug 18, 2026

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ltrzesniewski requested a review from Kuinox August 18, 2026 12:23

Kuinox approved these changes Aug 18, 2026

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Kuinox and others added 7 commits September 23, 2026 15:35

Add gated feature that replace peerid trailing guid by ".Client".

3295fc1

Remove peer directory metrics

8f47cdb

Make metric publication non-static

e5ed6d6

Pass metric publisher to outbound sockets

bff19e4

Report sent messages in socket instead of transport

6bb8268

Adjust connected socket metric publication

c9ed40c

- Group connections by PeerIdTag - Use UpDownCounter instead of Gauge - Remove total connected sockets (it can be derived from connected sockets) - Use an observable metric with absolute values to ensure late-listeners receive updates

Rename method in IZebusMetricPublisher

e18c89e

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Copilot AI commented Apr 24, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Metrics

Metric class organization

Multi-targeting

.NET 10 compatibility fixes

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Kuinox commented Apr 28, 2026

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I tried to connect to the following addresses, but was blocked by firewall rules:

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Copilot AI commented Apr 28, 2026

I tried to connect to the following addresses, but was blocked by firewall rules:

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Copilot AI commented Apr 28, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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I tried to connect to the following addresses, but was blocked by firewall rules:

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I tried to connect to the following addresses, but was blocked by firewall rules:

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