Add release notes 2026-04

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+# Temporary: exclude custom prompts until ready to share with team
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release-notes/2026-04/README.md

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+# SystemLink Enterprise 2026-04 Release Notes
+
+The 2026-04 release for SystemLink Enterprise has been published to
+<https://downloads.artifacts.ni.com>. This update includes new features, bug
+fixes, and security updates. Work with your account representative to obtain
+credentials to access these artifacts. If you are not upgrading from the
+previous release, refer to past release notes to ensure you have addressed all
+required configuration changes.
+
+## New Features and Behavior changes
+
+- Added the
+  [SystemLink Enterprise IT Administrators Manual](https://www.ni.com/docs/en-US/bundle/sle-it-admin/page/overview.html).
+  Use this manual to deploy, configure, and troubleshoot SystemLink Enterprise.
+- Added support for Reservation, Maintenance, Job, and Calibration work items.
+  For more information, refer to
+  [Managing Work Orders and Work Items](https://www.ni.com/docs/en-US/bundle/systemlink-enterprise/page/managing-work-orders-and-test-plans.html).
+- Added support for reserving multiple DUTs and other assets as part of test
+  plans.
+- Added support for providing granular privileges with each work item type.
+- Added support for high resolution zoom in the Data Frames Data Source. For
+  more information, refer to
+  [Using the Data Frames Data Source in a Dashboard](https://www.ni.com/docs/en-US/bundle/systemlink-enterprise/page/data-frames-data-source.html).
+- Added support for location search through the **Systems** application and the
+  **Assets** application.
+- Updated client Python APIs for alarms, assets, and file ingestion. For more
+  information, refer to the
+  [nisystemlink.clients Python API Documentation](http://www.ni.com/r/systemlink-python-api)
+  for nisystemlink 0.1.4.
+- `helium-serviceregistry:0.41.37`
+  - The `/niserviceregistry/v1` API now requires that clients present a valid
+    API key. The API does not enforce specific permissions. However, the client
+    must have Stratus authorization to access the configuration and status
+    information from the service registry API. Clients without authorization
+    receive a 401-error response.
+  - The API expects all clients to use a Stratus user interface. Because Stratus
+    already requires a login, this change should not affect most users. The
+    service registry includes a dependency on userservices. This API is not
+    available if userservices are not operative.
+  - Added per-user rate limiting on all routes to ensure consistent service
+    performance. These limits are generous and designed not to affect typical
+    usage. If you experience rate limiting issues, you can adjust the default
+    limits through the `serviceregistry.rateLimits` section of the Helm values
+    file.
+- `systemsmanagementservice:0.36.221`
+  - Added API-enforced 500-character limit for the `alias` property to improve
+    system performance. You can extend this limit by updating
+    `systems.systemLimits.alias.maxStringLength` in the Helm values file if
+    longer aliases are required.
+  - Added API-enforced limits to improve system security and performance:
+    `keywords count: 500`, `keyword string length: 500`, `property count: 1000`,
+    `property key string length: 500`, and `property value string length: 5000`.
+    These limits are not configurable through the Helm values file and should
+    accommodate typical usage patterns.
+- `assetservice:0.34.232`
+  - Added API-enforced keyword limits to improve system security and
+    performance: `keywords count: 500` and `keyword string length: 500`. These
+    limits are not configurable through the Helm values file and should
+    accommodate typical usage patterns.
+- `helium-serviceregistry:0.41.37`
+  - Custom roles now support resource-level specificity for work item
+    privileges. When configuring a role in the **Security** application, you can
+    now privilege specific work item types (such as Test Plan and Job) for that
+    role. Use the **Apply on all resources** option to grant broad access to a
+    role.
+
+## Helm Chart Breaking Changes
+
+- `SystemsManagementService:0.36.221`
+  - Added new chart for SystemsManagementService. This chart requires a
+    configuration for Elasticsearch. If SystemLink did not provision
+    Elasticsearch during deployment, you also need to set
+    `systems.secrets.elasticsearch.password`. To opt-out of using Elasticsearch,
+    refer to the
+    [SystemLink Enterprise User Manual](https://www.ni.com/docs/en-US/bundle/systemlink-enterprise/page/configuring-advanced-search.html).
+- `SystemsCDC:0.0.331`
+  - Added new chart for SystemsManagementServiceCDC. This chart requires
+    configurations for Elasticsearch, MongoDB, and file storage. To opt-out of
+    using Elasticsearch, refer to the
+    [SystemLink Enterprise User Manual](https://www.ni.com/docs/en-US/bundle/systemlink-enterprise/page/configuring-advanced-search.html).
+
+## Upgrade Considerations
+
+### RabbitMQ Version
+
+SystemLink Enterprise includes a deployment of the
+[RabbitMQ](https://www.rabbitmq.com/) message bus. Because you cannot skip minor
+versions when updating RabbitMQ, you may not be able to upgrade directly between
+versions of SystemLink Enterprise.
+
+The following table displays the version of the RabbitMQ dependency for each
+released version of SystemLink Enterprise. For more detailed update
+instructions, refer to
+[Updating SystemLink Enterprise](https://www.ni.com/docs/en-US/bundle/systemlink-enterprise/page/updating-systemlink-enterprise.html).
+
+| RabbitMQ Version | First SystemLink Enterprise Version | Last SystemLink Enterprise Version |
+| ---------------- | ----------------------------------- | ---------------------------------- |
+| 3.11.x           | 0.12.x                              | 0.15.x                             |
+| 3.12.x           | 0.16.x                              | 0.24.x                             |
+| 3.13.x           | 0.25.x                              | 0.29.56                            |
+| 4.0.x            | 0.30.74                             | 0.36.63                            |
+| 4.1.x            | 0.37.84                             | 0.43.92                            |
+| 4.2.x            | 0.44.55                             | current                            |
+
+## Bugs Fixed
+
+[SystemLink Enterprise 2026-04 Closed Bugs](https://github.com/ni/install-systemlink-enterprise/tree/2026-04/release-notes/2026-04/closed-bugs-sle-2026-04.xlsx)
+
+## Software Bill of Materials and Notices
+
+[SBOM](https://github.com/ni/install-systemlink-enterprise/tree/2026-04/release-notes/2026-04/sbom)
+
+[Notices](https://github.com/ni/install-systemlink-enterprise/tree/2026-04/release-notes/2026-04/notices)
+
+## Versions
+
+**Top Level Helm Chart:** `systemlink 0.48.69`
+
+**Admin Helm Chart:** `systemlink-admin 0.48.12`
+
+**Elasticsearch Helm Chart:** `systemlinkelasticsearch 0.10.29`
+
+### NI Containers
+
+```text
+alarmservice-routine-executor:0.23.115
+alarmservice:0.23.115
+alarmsui:0.33.66
+assetservice:0.34.232
+assetservicecdc:0.2.250
+assetui:0.33.97
+comments:0.32.81
+dashboardsui:0.36.74
+dataframeservice-nessie:1.28.86
+dataframeservice:1.28.86
+dremio-ee:25.2.25
+dynamicformfields:0.17.59
+executionsui:0.36.69
+feedservice:0.25.54
+feedsui:0.24.67
+fileingestioncdc:0.9.73
+filesui:0.37.82
+grafana-auth-proxy:0.35.11
+grafana-plugins:4.144.1
+grafana-rbac-integrator:0.35.84
+helium-dataservices-mongomigration:0.35.37
+helium-dataservices:0.35.37
+helium-fileingestionservices:1.26.58
+helium-salt-master:1.33.27
+helium-serviceregistry:0.41.37
+helium-taghistoriandataretention:0.31.24
+helium-taghistorianmongomigration:0.31.24
+helium-taghistorianservices:0.31.24
+helium-userservices:0.41.35
+helium-webappservices:0.39.44
+helium-webserver:0.48.47-18966136
+jupyter-notebook-userpod:2.27.11
+jupyterui:0.36.56
+labmanagementui:0.27.111
+landingpageui:0.36.60
+locationmanagementui:0.6.63
+locationservice:0.7.58
+nbexec-execution-helpers:0.37.56
+nbexec-notebook-runner:0.37.65
+nbexecservice:0.37.93
+nbparsingservice:0.36.25
+ni-grafana:v11.6.4-729684112f3-ni
+notification:0.36.58
+repository:0.32.51
+routineeventtrigger:0.37.46
+routineexecutor:0.37.84
+routinescheduletrigger:0.37.45
+routineservice-v2:0.38.51
+routineservice:0.38.51
+routinesui:0.37.113
+securityui:0.36.69
+session-manager-service:0.42.48
+sl-configurable-http-proxy:2.27.9
+sl-k8s-hub:2.27.11
+smtp:0.36.43
+specificationmanagement:0.27.43
+systemscdc:0.0.331
+systemsmanagementservice:0.36.221
+systemsstateservice:0.26.42
+systemsstatesui:0.25.70
+systemsui:0.37.134
+tageventprocessor:0.35.37
+tagsui:0.32.70
+testinsightsui:0.36.81
+testmonitorservice:0.45.84
+userdata:0.36.48
+userservice-setup:0.42.25
+webapphostui:0.35.68
+workitem:0.4.79-18963706
+```
+
+### 3rd Party Containers
+
+```text
+alpine/curl:8.17.0
+alpine:3.23.4
+apache/flink-kubernetes-operator:1.14.0
+argoproj/argocli:v3.7.8-linux-amd64
+argoproj/argoexec:v3.7.8-linux-amd64
+argoproj/workflow-controller:v3.7.8-linux-amd64
+bitnami-secure/containers/debian-12/elasticsearch:9.3.3-debian-12-r0
+bitnami-secure/containers/debian-12/kibana:9.3.3-debian-12-r0
+bitnami-secure/containers/debian-12/kubectl:1.35.4
+bitnami-secure/containers/debian-12/rabbitmq:4.2.5-debian-12-r1
+bitnami-secure/containers/debian-12/redis-cluster:8.6.2-debian-12-r0
+busybox:stable@sha256:05a79c7279f71f86a2a0d05eb72fcb56ea36139150f0a75cd87e80a4272e4e39
+jupyterhub/k8s-image-awaiter:4.2.0
+kiwigrid/k8s-sidecar:2.6.0
+pause:3.10
+swaggerapi/swagger-ui:v5.32.4
+zookeeper:3.9.5@sha256:0598e33ed585128313125f9c36cce6c164f0f21224e4bb75ca5c30b34655a13e
+```