chore: Remove support for Helm 2 (#1376)

Signed-off-by: Tom Kerkhove <kerkhove.tom@gmail.com>

build/azure-devops/agents-ci-scraper.yml

@@ -272,22 +272,6 @@ stages:
         - template: templates/docker/push-image.yml
           parameters:
               imageName: '$(Image.TaggedName)'
-- stage: Helm2
-  displayName: Helm Chart (2.x)
-  dependsOn: Docker
-  jobs:
-   - job: Helm2_x
-     displayName: Helm 2.x - Lint
-     condition: succeeded()
-     variables:
-       Helm.Version: '2.9.1'
-     pool:
-       vmImage: ubuntu-16.04
-     steps:
-     - template: templates/helm/lint-chart.yml
-       parameters:
-        helmVersion: '$(Helm.Version)'
-        chartName: '$(Chart.Scraper.Name)'
 - template: templates/stages/helm-chart-verification.yml
   parameters:
     chartName: '$(Helm.Chart.Name)'

changelog/content/deprecated/helm-2.0.md

@@ -0,0 +1,28 @@
+---
+title:
+subtitle: created on {{ now.Format "2020-11-23" }}
+date: 2020-11-23T12:00:00+01:00
+removal_date: 2020-11-23
+weight:
+version:
+---
+
+#### Helm 2.0
+
+###### Deprecated as of v1.6 and will be removed in v2.0
+
+Promitor provides Helm charts to simplify deployments on a Kubernetes cluster.
+
+In November 2019, Helm 3 was announced which marked the end of Helm 2 which would be phased out in a year and no longer
+ supported. Learn more about it in the official [Helm deprecation timeline](https://helm.sh/blog/helm-v2-deprecation-timeline/).
+
+Because of this deprecation, Promitor will no longer support Helm 2.0 deployments out-of-the-box. They might still be
+ working but won't be our focus for versions as of Promitor 2.0.
+
+**Announcement:** [GitHub Issue](https://github.com/tomkerkhove/promitor/issues/1371)
+
+**Impact:** Migration is required - Helm 2.0 deployments might still be working but is no longer supported.
+
+**Alternative:** Use Helm 3.0 by following [Helm migration guide](https://helm.sh/docs/topics/v2_v3_migration/).
+
+**Discussion:** [GitHub Discussions](https://github.com/tomkerkhove/promitor/discussions/1375)

changelog/content/deprecated/prometheus-legacy-configuration.md

@@ -23,8 +23,10 @@ Because of that we are removing support for the "legacy" Prometheus configuratio
 We've added support for Prometheus metric sink while maintaining the legacy approach until
  it's being removed.
 
+**Announcement:** [GitHub Issue](https://github.com/tomkerkhove/promitor/issues/1032)
+
 **Impact:** Migration is required - Prometheus legacy configuration will no longer be available.
 
 **Alternative:** Use our new [metric sink concept](https://promitor.io/configuration/v1.x/runtime#prometheus-scraping-endpoint).
 
-**Discussion:** [GitHub Issue #1032](https://github.com/tomkerkhove/promitor/issues/1032)
+**Discussion:** [GitHub Discussions](https://github.com/tomkerkhove/promitor/discussions/1372)

changelog/content/deprecated/swagger-2.0.md

@@ -1,4 +1,5 @@
 ---
+title:
 subtitle: created on {{ now.Format "2020-01-07" }}
 date: 2018-09-02T20:46:47+02:00
 removal_date: 2020-01-07
@@ -17,8 +18,10 @@ with 3.0 instead of 2.0.
 We've added support for OpenAPI 3.0 in Promitor v1.1 next to Swagger 2.0 so you
 can migrate to it before we remove 2.0 in Promitor v2.0.
 
+**Announcement:** [GitHub Issue](https://github.com/tomkerkhove/promitor/issues/782)
+
 **Impact:** Migration is required - API documentation will no longer be available.
 
 **Alternative:** Use API documentation provided in OpenAPI v3.0 format.
 
-**Discussion:** [GitHub Issue #782](https://github.com/tomkerkhove/promitor/issues/782)
+**Discussion:** [GitHub Discussions](https://github.com/tomkerkhove/promitor/discussions/1374)

changelog/content/deprecated/swagger-ui-2.0.md

@@ -18,8 +18,10 @@ with 3.0 instead of 2.0.
 We've added support for OpenAPI 3.0 in Promitor v1.1 next to Swagger 2.0 along with
 OpenAPI UI 3.0.
 
+**Announcement:** [GitHub Issue](https://github.com/tomkerkhove/promitor/issues/781)
+
 **Impact:** Migration is required - Swagger UI 2.0 will no longer be available.
 
 **Alternative:** Use OpenAPI UI 3.0.
 
-**Discussion:** [GitHub Issue #781](https://github.com/tomkerkhove/promitor/issues/781)
+**Discussion:** [GitHub Discussions](https://github.com/tomkerkhove/promitor/discussions/1373)

changelog/content/experimental/unreleased.md

@@ -42,6 +42,8 @@ version:
   | [FAQ](https://promitor.io/faq#why-does-my-multi-dimensional-metric-report-label-value-unknown-with-prometheus)).
 - {{% tag removed %}} Support for Prometheus legacy configuration ([deprecation notice](https://changelog.promitor.io/#prometheus-legacy-configuration)
  | [migration guide](https://promitor.io/walkthrough/migrate-from-1.x-to-2.x))
+- {{% tag removed %}} Support for Helm 2.0 ([deprecation notice](https://changelog.promitor.io/#helm-2-0) |
+ [Helm migration guide](https://helm.sh/docs/topics/v2_v3_migration/))
 - {{% tag removed %}} Support for Swagger UI 2.0 ([deprecation notice](https://changelog.promitor.io/#swagger-ui-2-0) |
  [migration guide](https://promitor.io/walkthrough/migrate-from-1.x-to-2.x))
 - {{% tag removed %}} Support for Swagger 2.0 ([deprecation notice](https://changelog.promitor.io/#swagger-2-0) |

docs/faq.md

@@ -5,24 +5,26 @@ title: Frequently asked questions (FAQs)
 
 Here are a list of questions you may have:
 
-- [What Azure clouds are supported?](#what-azure-clouds-are-supported)
-- [What operating systems are supported?](#what-operating-systems-are-supported)
-- [Is scraping multiple subscriptions supported?](#is-scraping-multiple-subscriptions-supported)
 - [Are multi-dimensional metrics supported?](#are-multi-dimensional-metrics-supported)
+- [Is scraping multiple subscriptions supported?](#is-scraping-multiple-subscriptions-supported)
+- [What Azure clouds are supported?](#what-azure-clouds-are-supported)
 - [Why does Azure Blob & File Storage only report account-level information?](#why-does-azure-blob--file-storage-only-report-account-level-information)
 - [Why does my multi-dimensional metric report label value `unknown` with Prometheus?](#why-does-my-multi-dimensional-metric-report-label-value-unknown-with-prometheus)
+- [What Helm version is supported?](#what-helm-version-is-supported)
+- [What operating systems are supported?](#what-operating-systems-are-supported)
 
-## What Azure clouds are supported?
-
-We support `Global` (default), `China`, `UsGov` & `Germany` Azure clouds.
-
-This can be configured in the metric configuration under `azureMetadata`.
+## Are multi-dimensional metrics supported?
 
-For more information see our ['Metric Configuration' page](/configuration/v1.x/metrics/#metrics).
+Yes, every scraper supports scraping multi-dimensional metrics except for
+Azure Storage queues.
 
-## What operating systems are supported?
+You can configure the dimension you are interested in via
+`azureMetricConfiguration.dimension.Name`, for more information see
+our ['Metric Configuration' page](/configuration/v1.x/metrics/#metrics).
 
-We support running on both Linux & Windows platforms.
+However, you can only use it with metrics in Azure Monitor that support this,
+for a complete overview we recommend reading the
+[official documentation](https://docs.microsoft.com/en-us/azure/azure-monitor/platform/metrics-supported).
 
 ## Is scraping multiple subscriptions supported?
 
@@ -33,18 +35,13 @@ However, you can deploy multiple instances of Promitor that each scrape another
 We have it on [our backlog](https://github.com/tomkerkhove/promitor/issues/761) to see if there is
  enough demand for it, feel free to give a :+1:. If that is the case, we will reconsider this limitation.
 
-## Are multi-dimensional metrics supported?
+## What Azure clouds are supported?
 
-Yes, every scraper supports scraping multi-dimensional metrics except for
-Azure Storage queues.
+We support `Global` (default), `China`, `UsGov` & `Germany` Azure clouds.
 
-You can configure the dimension you are interested in via
-`azureMetricConfiguration.dimension.Name`, for more information see
-our ['Metric Configuration' page](/configuration/v1.x/metrics/#metrics).
+This can be configured in the metric configuration under `azureMetadata`.
 
-However, you can only use it with metrics in Azure Monitor that support this,
-for a complete overview we recommend reading the
-[official documentation](https://docs.microsoft.com/en-us/azure/azure-monitor/platform/metrics-supported).
+For more information see our ['Metric Configuration' page](/configuration/v1.x/metrics/#metrics).
 
 ## Why does Azure Blob & File Storage only report account-level information?
 
@@ -60,4 +57,20 @@ When Promitor is unable to find a metric for a multi-dimensional metric, it will
 
 You can read more about it in our [Prometheus sink documentation](/configuration/v2.x/runtime/scraper/#what-happens-when-metrics-are-unavailable-for-multi-dimensional-metrics).
 
+## What Helm version is supported?
+
+Promitor supports deployments with **Helm v3.0** for all versions.
+
+Helm has [deprecated support for v2.0](https://helm.sh/blog/helm-v2-deprecation-timeline/) and is out of support.
+ Because of that, Promitor supported to remove support for Helm 2.0 as of Promitor 2.0.
+
+However, while we don't support it out-of-the-box it is possible that it is still compatible with Helm 2.0 but we do
+ not provide support for it.
+
+Join the discussion on our Helm v2.0 support deprecation on [GitHub Discussions](https://github.com/tomkerkhove/promitor/discussions/1375).
+
+## What operating systems are supported?
+
+We support running on both Linux & Windows platforms.
+
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