Phobos.Hosting 2.1.0

Akka.Hosting prototype support for Phobos.

Install-Package Phobos.Hosting -Version 2.1.0

dotnet add package Phobos.Hosting --version 2.1.0

<PackageReference Include="Phobos.Hosting" Version="2.1.0"/>

paket add Phobos.Hosting --version 2.1.0

Paket is a third-party, open source alternative to the NuGet client.

Release Notes

Phobos 2.1 Minor Release** Phobos 2.1 is a minor release that has been in the works for a long time and introduces several major features and improvements to the existing Phobos 2.0 experience. Akka.Cluster.Sharding Metrics and Dashboards** Issue: https://github.com/petabridge/phobos-issues/issues/72 One of the things we added support for in Phobos 2.1 is automatically tracking Akka.Cluster.Sharding metrics for each `ShardRegion` for each node capable of hosting any shards - these numbers can be aggregated together to form a complete picture of total shard allocation by type and node throughout your cluster. The new built-in metrics are: `akka.cluster.sharding.shards` - keeps track of the number of shards per node per entity type. `akka.cluster.sharding.entities` - keeps track of the number of entities per node per entity type. More Accurate "Live Actor" Counts** Phobos 2.1 takes advantage of a new actor telemetry feature introduced in [Akka.NET v1.4.47](https://github.com/akkadotnet/akka.net/releases/tag/1.4.47), whihc allows us to use an OpenTelemetry `ObservableGauge` to accurately track the total number of live actors by type and node throughout each of your `ActorSystem`s. > [!IMPORTANT] > In order to use this feature, you will need to set `akka.actor.telemetry.enabled = on` (it's `off` by default.) > > If you use Phobos.Hosting to configure Phobos, this setting will be automatically enabled for you. This value is now tracked via the `akka.actor.live` metric and will show up alongside the normal `akka.actor.created|stopped|restarted` counters. We've already incorporated `akka.actor.live` into our Phobos dashboards. Updated All Phobos Dashboards** We've incorporated all Phobos dashboards to incorporate the following new metric types: `akka.cluster.sharding.shards` - keeps track of the number of shards per node per entity type. `akka.cluster.sharding.entities` - keeps track of the number of entities per node per entity type. `akka.actor.live` - keeps more accurate track of the number of live actors per node by type. Please see "[Phobos Dashboards](https://phobos.petabridge.com/articles/dashboards/index.html)" for the most recent versions of each of these. Akka.Cluster.Sharding Trace Compression** One of the largest feature areas we've worked on for Phobos 2.1 is curtailing the amount of noise produced by Phobos tracing, especially in regards to features like Akka.Cluster.Sharding - where each message to one of your actors produces 2-3 spans recorded by built-in system actors. For starters, we now have the ability to compress Cluster.Sharding traces via an [OpenTelemetry `BaseProcessor<Activity>`](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/docs/trace/extending-the-sdk/README.md#processor) - and this can be enabled when you're subscribing to Phobos telemetry in your OTel pipeline: ```csharp services.AddOpenTelemetryTracing(builder => { builder .SetResourceBuilder(resource) .AddPhobosInstrumentation(compressShardTraces:true) // eliminate sharding infrastructure from traces .AddHttpClientInstrumentation() .AddAspNetCoreInstrumentation(options => { options.Filter = context => !context. Request.Path.StartsWithSegments("/metrics"); }) .SetSampler(new TraceIdRatioBasedSampler(1.0d)) .AddJaegerExporter(opt => { opt.AgentHost = Environment.GetEnvironmentVariable(JaegerAgentHostEnvironmentVar) ?? "localhost"; }); }); ``` Calling `.AddPhobosInstrumentation(compressShardTraces:true)` will enable trace compression for sharding. This value is set to `false` by default. In addition to these changes, we've also filtered out all internal messages and Akka.DistributedData messages by default. `Ask<T>` Tracing Improvements** We've made many significant improvements to `Ask<T>` tracing in Phobos 2.1: `Ask<T>` tracing can now be disabled via the fluent C# APIs or via `phobos.tracing.trace-ask = off`; `Ask<T>` tracing can now be filtered using the same `ITraceFilter` and other filter rules as regular `akka.actor.recv` statements; `Ask<T>` tracing has been restructured such that we now accurately capture both the input and output types separately - additionally, we are much more accurate in tracking start and stop times than we were previously. [Fixed: `Ask<T>` tracing does not properly follow `Tracer.ActiveSpan`](https://github.com/petabridge/phobos-issues/issues/74) To disable `Ask<T>` tracing via Phobos.Hosting, use the following: ```csharp collection.AddAkka("LocalSys", (builder, sp) => { builder.WithPhobos(AkkaRunMode.Local, configBuilder => configBuilder.WithTracing(t => t.SetTraceAsk(false))); AddTestActors(builder); }); ``` Other General Improvements** [Fixed: Phobos `DeadLetter` logging](https://github.com/petabridge/phobos-issues/issues/73). [Fixed: `Tracer.CurrentSpan` and `PhobosActorContext.ActiveSpan` should be the same when actor is processing message, but currently are not](https://github.com/petabridge/phobos-issues/issues/71). All `IWithTimers` messages are filtered out by default.