1.4.0

Get from NuGet and read the README

Highlights

Custom Slot Suppliers in Worker Tuners (experimental)

Worker tuners can now be created with custom slot suppliers. By providing a class extending Temporalio.Worker.Tuning.CustomSlotSupplier to a worker tuner, users can now control logic of when slots are available for use by the worker. This allows advanced, dynamic control over in-process tuning for how many concurrent activities, local activities, and workflow tasks can run. This is an advanced feature and is currently experimental which means future releases can technically update the API in incompatible ways.

User Metadata (experimental)

When starting workflows (directly, via update with start, via schedules, or via child workflows), users can now set a StaticSummary and/or StaticDetails option which may appear in the UI/CLI in the future. Similarly, users can provide Summary to timers and activity invocations. Finally, users can set the Workflow.CurrentDetails property to a string that can updated be throughout the life of the workflow based on the workflow's state. This value may also appear in the UI/CLI in the future. Values for summary or details can be in limited single-line or multi-line markdown format, respectively. This feature is currently experimental which means future releases can technically update the API in incompatible ways.

Update with Start Workflow (experimental)

Users can use StartUpdateWithStartWorkflowAsync or ExecuteUpdateWithStartWorkflowAsync on newer servers to perform an update with start. An update with start first starts a workflow if it does not exist (subject to conflict policy), and regardless of whether it started a workflow or not, sends an update. Depending on the call made, it either waits for the update to reach the worker/workflow, or waits for the update to complete. This is a very useful feature for those wanting to start a workflow and get back an early programmatic result but still let the rest of the workflow continue in the background. This feature is currently experimental which means future releases can technically update the API in incompatible ways.

Workflow Update No Longer Experimental

The "experimental" label has been removed from workflow update and it is no longer considered experimental.

Specific Changes

2024-10-08 - 6006744 - Add update ID and name in log scope (#355)
2024-10-08 - b33105e - Disallow open generics on activity methods (#354)
2024-10-08 - d505adc - Detached cancellation test (#352)
2024-10-08 - fb3c991 - Support failed completion building for activity (#353)
2024-10-31 - 6a858a2 - Upgrade dependency and add .NET 8 in one CI (#356)
2024-11-04 - 46410a6 - Update Rust dependencies and move to macos-13 in CI (#362)
2024-11-22 - 2400644 - Support DisableEagerActivityExecution option (#366)
2024-11-22 - c30a2db - Update Microsoft.Extensions.Hosting and other CI failure fixes (#370)
2024-11-25 - fe86f77 - Store MethodInfo when creating an ActivityDefinition (#369)
2024-12-04 - c219615 - Update Core (#376)
2024-12-05 - 15a3142 - Custom slot suplier (#372)
2024-12-06 - 66436bf - Add limit to list workflows (#377)
2024-12-11 - 2546f07 - User metadata and workflow metadata support (#378)
2024-12-11 - 301062a - Fix child workflow already exists and minor README updates (#379)
2024-12-11 - aac363d - Fix CI after GHA's drop of node16 actions (#374)
2024-12-13 - d073176 - Remove "experimental" tag from workflow update (#380)
2024-12-17 - 855047e - Update with start (#381)

1.3.1

Get from NuGet and read the README

Highlights

This is mostly bugfix release meant to address:

• Unable to send OpenTelemetry metrics over TLS
• Sporadic activity completion RPC cancellation

Specific Changes

2024-08-26 - aa3edef - Fix HTTP CONNECT proxy options not passing to core (#336)
2024-08-29 - 76e01fc - Fix BasicAuth bug in HttpConnectProxyOptions.ToInteropOptions() (#334)
2024-08-30 - 1985158 - Custom features repo branch in CI until after 1.3.0 (#338)
2024-08-30 - 622eda1 - Fix cloud CI run and minor doc fix (#339)
2024-09-03 - 681cd01 - Fix incorrect dep line (#341)
2024-09-05 - ec8821d - Properly clear metadata when encoding/decoding payloads (#343)
2024-09-06 - 73eaf2b - Moved info about WorkflowAlreadyStartedException into the right position in XML docs (#309)
2024-09-11 - 5141c2c - Update core and update version to 1.3.1 (#344)

1.3.0

Get from NuGet and read the README

Highlights

Warn on Unfinished Workflow Handlers

Previously if you had a signal handler or update handler that was not complete when the workflow was marked complete,
it'd silently be ignored/abandoned. Now you will get a warning. Users are encouraged to add
await Workflow.WaitConditionAsync(() => Workflow.AllHandlersFinished); to the bottom of their workflow to ensure they
have no outstanding handlers. If the previous no-warn situation is preferred, the signal/update attribute has a setting
to just abandon.

New Deterministic Async Helpers

While many Task based calls are safe for use in workflows (e.g. Task.WhenAll) there are some that are not (e.g.
Task.Run). So instead of only having some safe implementations of these and documenting others are safe, we wrapped
multiple in general. Some were added this release, so overall the set is:

• Workflow.DelayAsync - Safe form of Task.Delay
• Workflow.RunTaskAsync - Safe form of Task.Run or Task.Factory.StartNew
• Workflow.WhenAllAsync - Safe form of Task.WhenAll
• Workflow.WhenAnyAsync - Safe form of Task.WhenAny
• Temporalio.Workflows.Mutex - Safe form of System.Threading.Mutex
• Temporalio.Workflows.Semaphore - Safe form of System.Threading.Semaphore or System.Threading.SemaphoreSlim

Cloud Operations Client (EXPERIMENTAL)

For making operation-based calls against the cloud, there is now a Temporalio.Client.TemporalCloudOperationsClient
that implements ITemporalCloudOperationsClient and contains a static ConnectAsync method that works similar to the
TemporalClient version. There is a CloudService property on this client that gives raw access to the gRPC service.

This SDK API and the cloud operations API is experimental and may change in incompatible ways in the future.

Resource-based Worker Auto-tuning (EXPERIMENTAL)

Experimental support for worker tuning has been added along with an implementation for auto-tuning based on available
resources. TemporalWorkerOptions now has a Tuner field that can be set with an instance of
Temporalio.Worker.Tuning.IWorkerTuner. This can be a fixed-size based tuner via WorkerTuner.CreateFixedSize or based
on resources via WorkerTuner.CreateResourceBased. Technically the interface can be manually implemented to return
custom ISlotSuppliers, but only fixed-size and resource-based slot suppliers are currently supported, custom slot
suppliers will appear in the future.

This SDK API is experimental and may change in incompatible ways in the future.

Specific Changes

2024-07-01 - 29753e5 - Expose resource based autotuning (#293)
2024-07-01 - 9ce6b8f - Added exception notation to ConnectAsync method (#295)
2024-07-02 - 0d0334f - Minor test fixes (#296)
2024-07-02 - 72f6fb2 - Warn on unfinished workflow handlers (#294)
2024-07-02 - 8349537 - Add Temporalio.Workflows.Mutex (#298)
2024-07-08 - 4a6d4a0 - Experimental cloud operations client (#302)
2024-07-10 - 1fceb0b - Skip slow versioning test and update vuln dep (#301)
2024-07-12 - fa3867e - Support for workflow ID conflict policy (#304)
2024-07-18 - 23af803 - Use GH ARM runner (#308)
2024-07-19 - 32d1931 - Support query for listing schedules (#310)
2024-07-25 - df3b47a - Command reordering in Core (#315)
2024-08-02 - 64c3140 - Change default schedule catchup window to match API (#319)
2024-08-05 - 62da5d6 - Add workflow id conflict policy to signal with start (#322)
2024-08-05 - ac9c891 - Allow updating search attributes from schedule updates (#320)
2024-08-06 - 2ce6c99 - HTTP CONNECT proxy support (#318)
2024-08-06 - 66574bd - Add rule code and edit signal warning (#317)
2024-08-06 - 6695adf - Add Workflow.RunTaskAsync and Workflow.WhenAllAsync (#313)
2024-08-06 - 9ffc963 - Add features repo test to .NET CI (#324)
2024-08-07 - 89c43d1 - Add omes image build (#323)
2024-08-08 - 0b5a857 - Fix NuGet package smoke test (#326)
2024-08-09 - efdb9a0 - Do not warn about leftover handlers on workflow failure (#329)

1.2.0

Get from NuGet and read the README

Highlights

There are not any significant features introduced in this release. But there are a couple of minor features and several dependency updates.

Ensure coroutines complete on workflow complete

Before, if a workflow function returned, nothing else that returned after it would be accepted even if it occurred in the same task (i.e. same event loop run before returning). Now, to better support update handlers and other coroutines, we allow all other coroutines to reach their yielded point upon main workflow method return and we make sure their commands are included before the workflow completion. Care was taken to ensure this is deterministic with workflows in older SDK versions by retaining the previous behavior for those.

Temporalio.Workflow.Semaphore

A lightweight, workflow-safe alternative to SemaphoreSlim is now available as Temporalio.Workflow.Semaphore for use within a workflow.

Workflow update improvements

Can access update info inside update handlers and there is now a special exception thrown from update client calls when an the RPC is cancelled or times out.

Specific Changes

2024-06-06 - 5ed423f - Update core/dependencies and call worker validate (#267)
2024-06-06 - c299cec - Access current update info inside update handler (#268)
2024-06-11 - 3c6c7ac - Workflow completion command reordering (#270)
2024-06-11 - af5e004 - Bump GitHub Actions (#266)
2024-06-12 - bf26249 - Add exceptions to OTel client spans and minor 1.24 server test fixes (#272)
2024-06-13 - d3f3817 - Fix typo in CI workflow (#273)
2024-06-18 - a871164 - Set Rust callbacks to complete tasks asynchronously (#279)
2024-06-18 - c0058a1 - Download cURL in older Linux containers on binary build (#275)
2024-06-21 - 6f54944 - Fix improper casts during clone (#284)
2024-06-21 - 8b430c4 - Add workflow update RPC timeout/canceled exception (#283)
2024-06-26 - 8b7bd2a - Implementation of Temporalio.Workflow.Semaphore (#287)

1.1.2

Get from NuGet and read the README

Highlights

This is mostly a bug fix release.

💥 Fix Workflow.WaitConditionAsync issue introduced in 1.1.1

There is a bug introduced 1.1.1 where WaitConditionAsync could never be properly resolved. This release fixes that bug by (mostly) reverting to behavior in 1.1.0. There is technically a situation where, if your workflow has run in 1.1.1 and encountered this bug, this fix could lead to non-determinism.

💥 Breaking change on experimental workflow update

Updates, still experimental, now require the WaitForStage option to be set when using StartUpdateAsync. Also the UpdateID property in the options is just Id now.

Specific Changes

2024-05-21 - 618e878 - Required wait update stage and polling improvements (#251)
2024-05-22 - 1645178 - Improved docs for RetryPolicy.NonRetryableErrorTypes (#252)
2024-05-28 - ef70705 - Support ApplicationFailureException.NextRetryDelay (#254)
2024-05-29 - 1f6676b - Extended reporting of failed workflow with OTel (#255)
2024-06-04 - 0e24a43 - feat: add workflow client updater for updating workflow client (#258)
2024-06-04 - 43d0f86 - Update generated rpc requests to not omit ConfigureAwait(false) (#260)
2024-06-04 - 83670a0 - Fix wait condition evaluation issue (#259)

1.1.1

Get from NuGet and read the README

Highlights

This is just a bug-fix release, no significant highlights of note.

Specific Changes

2024-05-08 - 5cd6f59 - Run wait-condition callbacks in workflow context (#242)
2024-05-08 - f40e78e - Fix issue enumerating services in newer .NET DI library (#241)

1.1.0

Get from NuGet and read the README

Highlights

Experimental Workflow Failure Type Customization

When a workflow raises an exception that wasn't ApplicationFailureException or bubbled from a Temporal call (e.g. activity failure), it would be a "task failure" which puts the workflow in a suspended state retrying the task until a code fix is deployed. An experimental feature is now available that lets users set which exception types should instead fail the workflow instead of suspending it. Users can now set the per-workflow FailureExceptionTypes on the [Workflow] attribute or set the worker-level WorkflowFailureExceptionTypes option when creating the TemporalWorker. If an exception extends from one of these when raised, it will fail the workflow when raised.

Worker Client Replacement

Workers can now have the client they use replaced without shutting down the worker. The Client property on the TemporalWorker can be set to a different connected client. This is useful for users that need to change options like mTLS client certificate without worker downtime. The worker will not interrupt any polling calls but will start using the new client for subsequent calls.

API Key Client Option

If you use API keys in your Temporal server (i.e. Bearer tokens on Authorization headers), you can now set ApiKey option when connecting a TemporalClient/TemporalConnection or set the ApiKey property on an existing connection to update it.

Floats and Durations in Metrics

Users using MetricMeter directly to create metrics (off of runtime, activity, or workflow) can now create float-based histograms and gauges, and duration-based histograms. Similarly users using ICustomMetricMeter to retrieve metrics can say how they want to retrieve durations (float seconds, int milliseconds, or TimeSpan). A UseSecondsForDuration option was added to telemetry options for users that prefer seconds as float-based durations to OpenTelemetry and Prometheus instead of the default of integer milliseconds.

💥 This has a minor compatibility break. For users that implemented ICustomMetricMeter, calls on that interface can now start passing in double and TimeSpan where it didn't before, but only if users start using those types of metrics.

Counting Workflows

A new CountWorkflowsAsync call has been added to the ITemporalClient that takes the same query as ListWorkflowsAsync but is optimized just to perform counts.

Specific Changes

2024-01-05 - 0e592ee - Fix issue with DI-based static async activities (#172)
2024-01-10 - 53a8a3d - Properly ignore unknown fields when parsing history JSON (#175)
2024-01-12 - 7127437 - Add build id to workflow context (#174)
2024-01-19 - ba4763b - Fix issue with Rust cache using newer node version (#177)
2024-02-01 - 79104b6 - Prefix some errors with rule identifiers (#180)
2024-02-12 - bfe4b3a - Doc/README updates (#188)
2024-02-27 - 66abe70 - Update core (#192)
2024-02-28 - c703da9 - Add type-safe SignalWithStart (#193)
2024-03-01 - e99bcb0 - Eager workflow start (#195)
2024-03-07 - 666ab45 - Fix issue with unconfigured metric meter (#202)
2024-03-07 - ce3f195 - Worker poller and ratio options (#200)
2024-03-08 - 070fba5 - Use Debugger.IsAttached to affect default for debug mode (#201)
2024-03-12 - 3faaf2b - Client API key (#203)
2024-03-21 - 67a52ff - Ability for certain task failure types to fail workflow (#205)
2024-03-21 - d2be959 - Add Client.CountWorkflowsAsync (#206)
2024-03-26 - c6b7aca - Alternative CreateTemporalActivityDefinition (#207)
2024-03-29 - 7d37b9d - Fix README snippet (#213)
2024-04-02 - 070faac - Remove experimental flag from StartDelay (#208)
2024-04-16 - 740dfa2 - Use build ID in the unique DI identifier for workers (#216)
2024-04-19 - 1573d3a - Support duration and float metrics (#223)
2024-04-21 - e11dfd5 - Correct xmldoc spelling error on WorkflowAttribute (#227)
2024-04-22 - 899672c - Make ctor for DefaultPayloadConverter public to expose JsonSerializerOptions (#226)
2024-04-24 - 2bd9ed3 - Readme updates (#230)
2024-04-25 - 9c1c127 - Use macos-12 GHA runners instead of macos-latest (#232)
2024-04-26 - f1b8dde - Support macOS ARM + macOS Intel and update proto generation (#233)
2024-05-06 - e771d5b - Worker client replacement (#236)

1.0.0

Get from NuGet and read the README

Highlights

Temporal .NET SDK Generally Available

With this 1.0.0 release, the .NET SDK is now considered stable. This means it has been thoroughly used and tested to ensure it meets Temporal quality standards. Throughout the prerelease period, we have received ample feedback and have adjusted the SDK as needed to address feedback and address any issues encountered. We strive to not make any backwards incompatible changes.

Log Forwarding

The Core logic powering the SDK is written in Rust and emits its own logs to console in many situations. Until now, users could only control the level of this log but not adjust where it was emitted or how. Now, with #153, users can set Temporalio.Runtime.LoggingOptions.Forwarding.Logger to an ILogger which will forward all logs from Rust to the .NET logger in a reasonably performant manner.

Specific Changes

2023-11-08 - abab4b2 - Update README.md to remove note about DI issue (#152)
2023-11-14 - 67a2572 - Log forwarding (#153)
2023-11-16 - 32411c7 - Demonstrate OpenTelemetry + dependency injection (#154)
2023-11-17 - 8626167 - Delete .github/workflows/semgrep.yml (#159)
2023-12-04 - 7c07aa7 - Handle new .NET 8 analyzer suggestions (#164)

0.1.0-beta2

Get from NuGet and read the README

⚠️ This is a beta release.

Highlights

Advanced Metrics Support

The Rust core that the .NET SDK uses has always provided metrics and a way to export via OpenTelemetry or Prometheus. This release improves the exposure of these metrics in few ways:

First, a MetricMeter property has been added to TemporalRuntime, ActivityExecutionContext, and Workflow for those wanting to record their own metrics using the core-based metrics (but it is often still more desirable to use one's own metrics implementation). The Workflow.MetricMeter has logic to ignore metrics recorded inside workflows.

Second, a Temporal runtime is the overall object created to power Temporal features (if not using the default) and its MetricOptions now have a CustomMetricMeter which accepts a ICustomMetricMeter implementation. If set, this interface will be used for all core-based metrics.

Finally a new extension project, Temporalio.Extensions.DiagnosticSource, has been created which contains an ICustomMetricMeter implementation that sends core metrics to an underlying System.Diagnostics.Metrics.Meter implementation. So with this extension, users can have all internal SDK metrics flow through traditional .NET metrics utilities, even though they originate in Temporal's Rust core.

Several Minor Additions

• Added Workflow.CurrentHistoryLength, Workflow.CurrentHistorySize, and Workflow.ContinueAsNewSuggested to help developers understand history sizes and when to continue as new
• Added WorkflowInfo.LastFailure and WorkflowInfo.LastResult for use by workflow retrying and schedules
• Added TemporalConnectionOptions.KeepAlive to support client keep alive, and defaulted it to 30s interval with 15s timeout
• Added WorkflowOptions.StartDelay to add a delay to the start of a workflow
• Added experimental support for workflow update which is only available in bleeding edge open source server environments

💥 BREAKING CHANGES

Only a couple of barely visible, rarely used things were changed this release:

• Static methods on for creating activity definitions Temporalio.Activities.ActivityDefinition removed cache boolean parameter since caching of activity definitions is no longer that valuable (#118)
• Removed Temporalio.Runtime.TelemetryOptions.Tracing property and associated class since this was only for advanced internal support for core tracing (i.e. not related to actual Temporal/workflow tracing)

Specific Changes

2023-07-25 - 0cded9b - Remove activity definition cache (#118)
2023-07-25 - 54e61f1 - Clarify in README clients can use the extension project (#120)
2023-07-25 - 612d4ca - Use DI logger factory in worker service and DI clients (#119)
2023-08-07 - 9b92709 - Add history info for workflow (#123)
2023-08-21 - 5b559d5 - Update core and tonic (#127)
2023-08-25 - 9d56fe8 - Improved .NET metrics support (#129)
2023-09-22 - 5cf7a4a - Expose LastFailure and LastResult from WorkflowInfo (#136)
2023-10-06 - 516c72b - Advanced .NET metrics support (#137)
2023-10-09 - ab4ded4 - Client keep alive support (#138)
2023-10-20 - 1cde5c9 - Add missing gRPC calls (#144)
2023-10-24 - bd986d7 - Workflow start delay (#146)
2023-10-25 - ef02df3 - Workflow update (#142)

0.1.0-beta1

Get from NuGet and read the README

⚠️ This is a beta release and compatibility may not be maintained.

Highlights

This release contains minor improvements over the last alpha release and some breaking changes.

Beta Release

This is the first beta release! This means that the .NET SDK, after months of hard work and feedback, is beta quality. The SDK has been well tested and most major API changes have been settled. Technically breaking changes may still occur until the SDK is marked GA, but we will make clear in these release notes if that occurs.

Experimental Worker Versioning

Support has been added for the brand new Worker Versioning feature. This feature is currently experimental and can only be enabled when running the open source server and setting some special options. Samples for the versioning feature will be present soon.

Better Client Dependency Injection and Lazy Client Support

The Temporalio.Extensions.Hosting extension has a new IServiceCollection.AddTemporalClient extension method which registers a client as a singleton and only connects lazily upon first call. This is made possible by the new TemporalClient.CreateLazy static helper. The client can also be used via dependency injection in worker services.

💥 BREAKING CHANGES

The following refactors occurred:

• Changed identifiers containing Cancelled to Canceled
• Changed identifiers containing ID to Id

Specific Changes

2023-07-17 - 945f058 - .NET framework copy targets and smoke test (#102)
2023-07-17 - 9cb71af - Worker Versioning (#103)
2023-07-18 - 0dc06cd - Versioning enum updates, rename "Cancelled" identifiers to "Canceled", and README updates (#112)
2023-07-18 - 32ef77e - Minor README and API doc updates (#96)
2023-07-18 - 370d479 - Rename ID to Id (#111)
2023-07-18 - 52d6868 - Lazy clients, client DI, and health check (#98)
2023-07-20 - 1c14789 - Log and drop signals when we can't decode the arguments (#114)
2023-07-24 - dee4538 - Support for experimental workflow task events (#113)