charts/wire-server-metrics: drop (#2740)

This seems to have gotten broken, it complains about some resources that
can't be found:

```
level=error ts=2022-09-30T08:09:08.703284478Z caller=klog.go:116 component=k8s_client_runtime func=ErrorDepth msg="status \"default/wire-server-metrics-kube-p-prometheus\" failed: failed to update status subresource: prometheuses.monitoring.coreos.com \"wire-server-metrics-kube-p-prometheus\" not found"
```

Describing how to install a monitoring system, shipping our own wrapper
chart, and documenting how to install it shouldn't be something we did
in first place. It's a potential endless game of whack-a-mole with
upstream changes, and mirroring it downstream in our documentation
shouldn't be part of wire-server.

Instead, describe what wire-server can do, how it marks its metrics
endpoints via ServiceMonitor, and refer to the upstream docs of two
commonly used metrics operators.

Author: flokli

CHANGELOG.md

@@ -487,7 +487,7 @@
   removed.
 
   Instead, all services that expose metrics will now create `ServiceMonitor`
-  resources, if their helm chart is applied with `metrics.serviceMonitor.enable`
+  resources, if their helm chart is applied with `metrics.serviceMonitor.enabled`
   set to true.
 
   This prevents scraping agents from querying services that don't expose metrics

Makefile

@@ -7,13 +7,13 @@ DOCKER_TAG            ?= $(USER)
 # default helm chart version must be 0.0.42 for local development (because 42 is the answer to the universe and everything)
 HELM_SEMVER           ?= 0.0.42
 # The list of helm charts needed on internal kubernetes testing environments
-CHARTS_INTEGRATION    := wire-server databases-ephemeral redis-cluster fake-aws nginx-ingress-controller nginx-ingress-services wire-server-metrics fluent-bit kibana sftd restund coturn
+CHARTS_INTEGRATION    := wire-server databases-ephemeral redis-cluster fake-aws nginx-ingress-controller nginx-ingress-services fluent-bit kibana sftd restund coturn
 # The list of helm charts to publish on S3
 # FUTUREWORK: after we "inline local subcharts",
 # (e.g. move charts/brig to charts/wire-server/brig)
 # this list could be generated from the folder names under ./charts/ like so:
 # CHARTS_RELEASE := $(shell find charts/ -maxdepth 1 -type d | xargs -n 1 basename | grep -v charts)
-CHARTS_RELEASE        := wire-server redis-ephemeral redis-cluster databases-ephemeral fake-aws fake-aws-s3 fake-aws-sqs aws-ingress  fluent-bit kibana backoffice calling-test demo-smtp elasticsearch-curator elasticsearch-external elasticsearch-ephemeral minio-external cassandra-external nginx-ingress-controller nginx-ingress-services reaper wire-server-metrics sftd restund coturn inbucket
+CHARTS_RELEASE        := wire-server redis-ephemeral redis-cluster databases-ephemeral fake-aws fake-aws-s3 fake-aws-sqs aws-ingress  fluent-bit kibana backoffice calling-test demo-smtp elasticsearch-curator elasticsearch-external elasticsearch-ephemeral minio-external cassandra-external nginx-ingress-controller nginx-ingress-services reaper sftd restund coturn inbucket
 BUILDAH_PUSH          ?= 0
 KIND_CLUSTER_NAME     := wire-server
 BUILDAH_KIND_LOAD     ?= 1

changelog.d/0-release-notes/wire-server-metrics-removal

@@ -0,0 +1,5 @@
+The experimental wire-server-metrics helm chart has been removed.
+
+These were mostly a wrapper around prometheus operator. It makes more sense to
+refer to the upstream docs of Prometheus Operator or Grafana Agent Operator for
+installation instead.

charts/nginx-ingress-services/README.md

@@ -52,8 +52,3 @@ A: Ensure that your certificate is _valid_ and has _not expired_; trying to serv
 
 * the `apiVersion` of all resources based on cert-manager's CRDs, namely `./templates/issuer.yaml` and 
   `./templates/certificate.yaml`, has to be changed to `cert-manager.io/v1alpha3`
-
-
-### Monitoring
-
-__FUTUREWORK:__ When `wire-server-metrics` is ready, expiration & renewal should be integrated into monitoring.

charts/wire-server-metrics/.helmignore

@@ -3,215 +3,19 @@
 Monitoring wire-server using Prometheus and Grafana
 =======================================================
 
-Introduction
-------------
+All wire-server helm charts offering prometheus metrics expose a
+`metrics.serviceMonitor.enabled` option.
 
-The following instructions detail the installation of a monitoring
-system consisting of a Prometheus instance and corresponding Alert
-Manager in addition to a Grafana instance for viewing dashboards related
-to cluster and wire-services health.
+If these are set to true, the helm charts will install `ServiceMonitor`
+resources, which can be used to mark services for scraping by
+[Prometheus Operator](https://prometheus-operator.dev/),
+[Grafana Agent Operator](https://grafana.com/docs/grafana-cloud/kubernetes-monitoring/agent-k8s/),
+or similar prometheus-compatible tools.
 
-Prerequisites
--------------
+Refer to their documentation for installation.
 
-You need to have wire-server installed, see either of
-
-* :ref:`helm`
-* :ref:`helm_prod`.
-
-How to install Prometheus and Grafana on Kubernetes using Helm
----------------------------------------------------------------
-
-.. note::
-
-    The following makes use of overrides for helm charts. You may wish to read :ref:`understand-helm-overrides` first.
-
-Create an override file:
-
-.. code:: bash
-
-    mkdir -p wire-server-metrics
-    curl -sSL https://raw.githubusercontent.com/wireapp/wire-server-deploy/master/values/wire-server-metrics/demo-values.example.yaml > wire-server-metrics/values.yaml
-
-And edit this file by editing/uncommenting as needed with respect to the next sections.
-
-The monitoring system requires disk space if you wish to be resilient to
-pod failure. This disk space is given to pods by using a so-called "Storage Class". You have three options:
-
-* (1) If you deploy on a kubernetes cluster hosted on AWS you may install the ``aws-storage`` helm chart which provides configurations of Storage Classes for AWS's elastic block storage (EBS). For this, install the aws storage classes with ``helm upgrade --install aws-storage wire/aws-storage --wait``.
-* (2) If you're not using AWS, but you sill want to have persistent metrics, see :ref:`using-custom-storage-classes`.
-* (3) If you don't want persistence at all, see :ref:`using-no-storage-classes`.
-
-Once you have a storage class configured (or put the override configuration to not use persistence), next we can install the monitoring suite itself.
-
-There are a few known issues surrounding the ``prometheus-operator``
-helm chart.
-
-You will likely have to install the Custom Resource Definitions manually
-before installing the ``wire-server-metrics`` chart:
-
-::
-
-   kubectl apply -f https://raw.githubusercontent.com/coreos/prometheus-operator/d34d70de61fe8e23bb21f6948993c510496a0b31/example/prometheus-operator-crd/alertmanager.crd.yaml
-   kubectl apply -f https://raw.githubusercontent.com/coreos/prometheus-operator/d34d70de61fe8e23bb21f6948993c510496a0b31/example/prometheus-operator-crd/prometheus.crd.yaml
-   kubectl apply -f https://raw.githubusercontent.com/coreos/prometheus-operator/d34d70de61fe8e23bb21f6948993c510496a0b31/example/prometheus-operator-crd/prometheusrule.crd.yaml
-   kubectl apply -f https://raw.githubusercontent.com/coreos/prometheus-operator/d34d70de61fe8e23bb21f6948993c510496a0b31/example/prometheus-operator-crd/servicemonitor.crd.yaml
-
-Now we can install the metrics chart, run the following::
-
-   helm upgrade --install wire-server-metrics wire/wire-server-metrics --wait -f wire-server-metrics/values.yaml
-
-See the `Prometheus Operator
-README <https://github.com/helm/charts/tree/master/stable/prometheus-operator#work-arounds-for-known-issues>`__
-for more information and troubleshooting help.
-
-Adding Dashboards
------------------
-
-Grafana dashboard configurations are included as JSON inside the
-``charts/wire-server-metrics/dashboards`` directory. You may import
-these via Grafana's web UI. See `Accessing
-grafana <#accessing-grafana>`__.
-
-Monitoring in a separate namespace
-----------------------------------
-
-It is advisable to separate your monitoring services from your
-application services. To accomplish this you may deploy
-``wire-server-metrics`` into a separate namespace from ``wire-server``.
-Simply provide a different namespace to the ``helm upgrade --install``
-calls with ``--namespace your-desired-namespace``.
-
-The wire-server-metrics chart will monitor all wire services across *all* namespaces.
-
-Accessing grafana
+Dashboards
 -----------------
 
-Forward a port from your localhost to the grafana service running in
-your cluster:
-
-::
-
-   kubectl port-forward service/<release-name>-grafana 3000:80 -n <namespace>
-
-Now you can access grafana at ``http://localhost:3000``
-
-The username and password are stored in the ``grafana`` secret of your
-namespace
-
-By default this is:
-
--  username: ``admin``
--  password: ``admin``
-
-Accessing prometheus
---------------------
-
-Forward a port from your localhost to the prometheus service running in
-your cluster:
-
-::
-
-   kubectl port-forward service/<release-name>-prometheus 9090:9090 -n <namespace>
-
-Now you can access prometheus at ``http://localhost:9090``
-
-
-Customization
----------------
-
-.. _using-no-storage-classes:
-
-Monitoring without persistent disk
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-If you wish to deploy monitoring without any persistent disk (not
-recommended) you may add the following overrides to your ``values.yaml``
-file.
-
-.. code:: yaml
-
-   # This configuration switches to use memory instead of disk for metrics services
-   # NOTE: If the pods are killed you WILL lose all your metrics history
-   kube-prometheus-stack:
-     grafana:
-       persistence:
-         enabled: false
-     prometheus:
-       prometheusSpec:
-         storageSpec: null
-     alertmanager:
-       alertmanagerSpec:
-           storage: null
-
-.. _using-custom-storage-classes:
-
-Using Custom Storage Classes
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-If you're using a provider other than AWS please reference the
-`Kubernetes documentation on storage
-classes <https://kubernetes.io/docs/concepts/storage/storage-classes/>`__
-for configuring a storage class for your kubernetes cluster.
-
-If you wish to use a different storage class (for instance if you don't
-run on AWS) you may add the following overrides to your ``values.yaml``
-file.
-
-.. code:: yaml
-
-   kube-prometheus-stack:
-     grafana:
-       persistence:
-         storageClassName: "<my-storage-class>"
-     prometheus:
-       prometheusSpec:
-         storageSpec:
-           volumeClaimTemplate:
-             spec:
-               storageClassName: "<my-storage-class>"
-     alertmanager:
-       alertmanagerSpec:
-         storage:
-           volumeClaimTemplate:
-             spec:
-               storageClassName: "<my-storage-class>"
-
-
-Troubleshooting
----------------
-
-"validation failed"
-^^^^^^^^^^^^^^^^^^^^^
-
-If you receive the following error:
-
-::
-
-   Error: validation failed: [unable to recognize "": no matches for kind "Alertmanager" in version
-   "monitoring.coreos.com/v1", unable to recognize "": no matches for kind "Prometheus" in version
-   "monitoring.coreos.com/v1", unable to recognize "": no matches for kind "PrometheusRule" in version
-
-Please run the script to install Custom Resource Definitions which is
-detailed in the installation instructions above.
-
-"object is being deleted"
-^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-When upgrading you may see the following error:
-
-::
-
-   Error: object is being deleted: customresourcedefinitions.apiextensions.k8s.io "prometheusrules.monitoring.coreos.com" already exists
-
-Helm sometimes has trouble cleaning up or defining Custom Resource
-Definitions. Try manually deleting the resource definitions and trying
-your helm install again:
-
-::
-
-   kubectl delete customresourcedefinitions \
-     alertmanagers.monitoring.coreos.com \
-     prometheuses.monitoring.coreos.com \
-     servicemonitors.monitoring.coreos.com \
-     prometheusrules.monitoring.coreos.com
+Grafana dashboard configurations are included as JSON inside the ``dashboards``
+directory. You may import these via Grafana's web UI.