docs: add glasskube keptn integration blog post (#3267)

Co-authored-by: Moritz Wiesinger <[email protected]>

.github/actions/spelling/expect.txt

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+finalizer
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+glasskube
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+GOGC
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docs/blog/.authors.yml

@@ -24,3 +24,8 @@ authors:
     description: Docs Maintainer
     avatar: https://avatars.githubusercontent.com/u/26523841?v=4
     url: https://github.com/agardnerIT
+  pmig:
+    name: Philip Miglinci
+    description: Co-Founder Glasskube
+    avatar: https://avatars.githubusercontent.com/u/3041752?v=4
+    url: https://github.com/pmig

docs/blog/posts/glasskube-keptn.md

@@ -0,0 +1,152 @@
+---
+date: 2024-03-14
+authors: [ pmig ]
+description: >
+  In this blog post you will learn how to install and update Keptn via the Glasskube Package Manager.
+categories:
+  - SRE
+  - Glasskube
+  - Installation
+  - Upgrade
+comments: true
+slug: install-keptn-with-glasskube
+---
+
+# Keptn is now officially available via the Glasskube Package Manager for Kubernetes
+
+We are happy to announce that Keptn is now officially available via the Glasskube Package Manager to bring Keptn
+to even more users.
+
+Installing packages for Kubernetes clusters is one of the most pressing issues in the Cloud Native community.
+There are still some unaddressed challenges like managing dependencies and streamlining updates across multiple
+packages.
+
+In this article we give an overview about Glasskube, Keptn and how the installation works.
+
+<!-- more -->
+
+## What is Glasskube?
+
+[Glasskube](https://glasskube.dev) is the next generation package manager for Kubernetes and part of the CNCF
+landscape.
+
+Inspired by traditional package managers like `brew`, `apt` or `dnf`, Glasskube allows users to easily find, install
+and update packages for Kubernetes.
+Glasskube packages are dependency aware, so if multiple packages require for
+example cert-manager, it only gets installed once in the recommended namespace and can then be utilized by multiple packages.
+Glasskube not only provides a streamlined CLI experience, but also a simple UI for managing Kubernetes packages.
+Glasskube itself is designed as a Cloud Native application and every installed package is represented by a
+Custom Resource.
+This comes in handy if packages and Glasskube itself should be managed via a GitOps approach.
+
+[`glasskube/glasskube`](https://github.com/glasskube/glasskube/) is in active development, with _good first issues_
+available for new contributors.
+
+## What is Keptn?
+
+[Keptn](https://keptn.sh/) is a CNCF project for continuous delivery and automated operations.
+It helps developers and platform engineering teams automate deployment, monitoring, and management of applications
+running in cloud environments.
+Keptn works with standard deployment software like ArgoCD or Flux, consolidating metrics, observability, and analysis
+for all the microservices that comprise your deployed software as well as providing checks and executables that can
+run before and/or after the deployment.
+
+## Keptn package on Glasskube
+
+The supported Keptn versions and packages can be found in the Glasskube package repository:
+[`glasskube/packages/keptn`](https://github.com/glasskube/packages/tree/main/packages/keptn)
+
+As Keptn requires a certificate in order to interact with the Kubernetes API it can either make use of cert-manager.io
+or it alternatively packages its own certificate manager.
+In the Glasskube package yaml there is a dependency on `cert-manager` configured:
+
+```yaml
+name: "keptn"
+shortDescription: >-
+  Supercharge your deployments with Keptn! Keptn provides a “cloud-native” approach for managing the application
+  release lifecycle metrics, observability, health checks, with pre- and post-deployment evaluations and tasks.
+iconUrl: "https://raw.githubusercontent.com/cncf/artwork/main/projects/keptn/icon/color/keptn-icon-color.svg"
+defaultNamespace: "keptn-system"
+manifests:
+  - url: https://glasskube.github.io/packages/packages/keptn/v2.0.0-rc.1+1/keptn.yaml
+  - url: https://glasskube.github.io/packages/packages/keptn/v2.0.0-rc.1+1/keptn-cert.yaml
+  - url: https://glasskube.github.io/packages/packages/keptn/v2.0.0-rc.1+1/keptn-issuer.yaml
+dependencies:
+  - name: "cert-manager"
+```
+
+## Installation of Keptn with Glasskube
+
+### Install Glasskube
+
+If you haven't already installed the `glasskube` client you can install it either via `brew` or follow the
+[Glasskube Documentation](https://glasskube.dev/docs/getting-started/install/).
+
+```shell
+brew install glasskube/tap/glasskube
+```
+
+After installing Glasskube, you can bootstrap Glasskube with `glasskube bootstrap` or perform an automatic
+bootstrap with your first package installation.
+
+### Keptn installation with the Glasskube CLI
+
+You simply install Keptn with:
+
+```shell
+glasskube install keptn
+```
+
+After the installation you can validate that all components have been installed by running by executing:
+
+```shell
+kubectl get all -n keptn-system
+```
+
+### Keptn installation with the Glasskube GUI
+
+Glasskube provides an easy way to install Keptn with a graphical user interface.
+
+#### 1. Open the Glasskube GUI with
+
+The first step is to open the Glasskube GUI with the `serve` command.
+
+```shell
+glasskube serve
+```
+
+#### 2. Install Keptn via the web browser
+
+Your default web browser will open on [http://localhost:8580](http://localhost:8580).
+
+![Glasskube overview](./../install-keptn-with-glasskube/glasskube.png "Glasskube overview")
+
+Where you just need to click the "Install" Button for Keptn.
+
+![Glasskube keptn](./../install-keptn-with-glasskube/glasskube-keptn.png "Keptn installation via Glasskube")
+
+You can also choose if you want to enable automatic updates or install a specific version.
+
+#### 3. Validate Keptn installation
+
+After some time the Glasskube GUI automatically updates the state of the installed package.
+
+![Glasskube Keptn success](./../install-keptn-with-glasskube/glasskube-keptn-success.png "Keptn installation success")
+
+After the installation you can validate that all components have been installed executing:
+
+```shell
+kubectl get all -n keptn-system
+```
+
+## Summary
+
+Keptn is now officially available via the Glasskube Package Manager and can easily be installed and updated via a CLI,
+GUI or GitOps solutions like ArgoCD or FluxCD.
+
+## Useful links
+
+- <https://glasskube.dev/>
+- <https://helm.sh/>
+- <https://github.com/glasskube/glasskube/>
+- <https://github.com/glasskube/packages/>