diff --git a/helm/observability-operator/files/alertmanager/alertmanager.yaml.helm-template b/helm/observability-operator/files/alertmanager/alertmanager.yaml.helm-template
new file mode 100644
index 00000000..982788d4
--- /dev/null
+++ b/helm/observability-operator/files/alertmanager/alertmanager.yaml.helm-template
@@ -0,0 +1,486 @@
+global:
+  resolve_timeout: 5m
+  http_config:
+    proxy_from_environment: true
+{{- if .Values.alerting.slackAPIToken }}
+  slack_api_url: "https://slack.com/api/chat.postMessage"
+{{- else }}
+  slack_api_url: {{ .Values.alerting.slackAPIURL }}
+{{- end }}
+
+templates:
+  - notification-template.tmpl
+  - url-template.tmpl
+
+route:
+  group_by: [alertname, cluster_id, installation, status, team]
+  group_interval: 15m
+  group_wait: 5m
+  repeat_interval: 4h
+  receiver: root
+
+  routes:
+  - receiver: heartbeat
+    matchers:
+    - alertname="Heartbeat"
+    # TODO(@team-atlas): This label is needed for now because we support legacy and new heartbeat alerts. Lets remove it when we remove https://github.com/giantswarm/prometheus-rules/pull/1094/files#diff-2cc8f3328e242b6c86769bfb52b286c7146e074dd244ebb76a0025c838f33d0fR21
+    - type="mimir-heartbeat"
+    continue: true
+    group_wait: 30s
+    group_interval: 30s
+    repeat_interval: 15m
+  {{- if eq .Values.managementCluster.pipeline "stable-testing" }}
+  - receiver: blackhole
+    matchers:
+    - cluster_type="workload_cluster"
+    continue: false
+  - receiver: blackhole
+    matchers:
+    - cluster_id=~"t-.*"
+    continue: false
+  - receiver: blackhole
+    matchers:
+    - alertname=~"WorkloadClusterApp.*"
+    continue: false
+  - receiver: blackhole
+    matchers:
+    - alertname="PrometheusMetaOperatorReconcileErrors"
+    continue: false
+  - receiver: blackhole
+    matchers:
+    - alertname="ClusterUnhealthyPhase"
+    continue: false
+  - receiver: blackhole
+    matchers:
+    - alertname="ClusterUnhealthyPhase"
+    - name=~"t-.*"
+    continue: false
+  # We don't want to get alerts by workload cluster apps that are failing.
+  # We select those by checking if the App CR is in a namespace starting with 'org-'.
+  - receiver: blackhole
+    matchers:
+    - alertname="ManagementClusterAppFailed"
+    - namespace=~"org-.*"
+    continue: false
+  {{- end }}
+
+  # Falco noise Slack
+  - receiver: falco_noise_slack
+    matchers:
+    - alertname=~"Falco.*"
+    continue: false
+
+  - receiver: team_tenet_slack
+    repeat_interval: 14d
+    matchers:
+    - severity=~"page|notify"
+    - team=~"tenet|tinkerers"
+    continue: false
+
+  # Team Ops Opsgenie
+  - receiver: opsgenie_router
+    matchers:
+    - severity="page"
+    continue: true
+
+  # Team Atlas Slack
+  - receiver: team_atlas_slack
+    matchers:
+    {{- if eq .Values.managementCluster.pipeline "stable" }}
+    - severity="notify"
+    {{- else }}
+    - severity=~"page|notify"
+    {{- end }}
+    - team="atlas"
+    - type!="heartbeat"
+    - alertname!~"Inhibition.*"
+    - alertname!="Heartbeat"
+    continue: false
+
+  # Team Celestial Slack
+  - receiver: team_phoenix_slack
+    matchers:
+    - severity=~"page|notify"
+    - team="celestial"
+    - sloth_severity=~"page|ticket"
+    continue: false
+
+  # Team Firecracker Slack
+  - receiver: team_phoenix_slack
+    matchers:
+    - severity=~"page|notify"
+    - team="firecracker"
+    - sloth_severity=~"page|ticket"
+    continue: false
+
+  # Team Phoenix Slack
+  - receiver: team_phoenix_slack
+    matchers:
+    - team="phoenix"
+    - sloth_severity="page"
+    - silence="true"
+    continue: false
+
+  # Team Shield Slack
+  - receiver: team_shield_slack
+    matchers:
+    - severity=~"page|notify"
+    - team="shield"
+    continue: false
+
+  # Team BigMac Slack
+  - receiver: team_bigmac_slack
+    matchers:
+    - severity=~"page|notify"
+    - team="bigmac"
+    continue: false
+
+  # Team Clippy Slack
+  # ReRoute to `phoenix` until we change all team ownership labels
+  - receiver: team_phoenix_slack
+    matchers:
+    - severity=~"page|notify"
+    - team="clippy"
+    continue: false
+
+  # Team Rocket Slack
+  - receiver: team_rocket_slack
+    matchers:
+    - severity=~"page|notify"
+    - team="rocket"
+    continue: false
+
+  # Team Turtles Slack
+  - receiver: team_turtles_slack
+    matchers:
+    - severity=~"page|notify"
+    - team="turtles"
+    continue: false
+
+  # Team Honeybadger Slack
+  - receiver: team_honeybadger_slack
+    matchers:
+    - severity=~"page|notify"
+    - team="honeybadger"
+    continue: false
+
+receivers:
+- name: root
+
+- name: heartbeat
+  webhook_configs:
+  - send_resolved: false
+    http_config:
+      authorization:
+        type: GenieKey
+        credentials: {{ .Values.monitoring.opsgenieApiKey }}
+      follow_redirects: true
+      enable_http2: true
+      proxy_from_environment: true
+    url: https://api.opsgenie.com/v2/heartbeats/{{ .Values.managementCluster.name }}/ping
+
+{{- if eq .Values.managementCluster.pipeline "stable-testing" }}
+- name: blackhole
+{{- end }}
+
+- name: falco_noise_slack
+  slack_configs:
+  - channel: '#noise-falco'
+    http_config:
+      {{- if .Values.alerting.slackAPIToken }}
+      authorization:
+        type: Bearer
+        credentials: {{ .Values.alerting.slackAPIToken }}
+      {{- end }}
+      proxy_from_environment: true
+    send_resolved: true
+    actions: &slack-actions
+    - type: button
+      text: ':green_book: OpsRecipe'
+      url: '{{`{{ template "__runbookurl" . }}`}}'
+      style: '{{`{{ if eq .Status "firing" }}primary{{ else }}default{{ end }}`}}'
+    - type: button
+      text: ':coffin: Linked PMs'
+      url: '{{`{{ template "__alert_linked_postmortems" . }}`}}'
+    - type: button
+      text: ':mag: Query'
+      url: '{{`{{ template "__alerturl" . }}`}}'
+    - type: button
+      text: ':grafana: Dashboard'
+      url: '{{`{{ template "__dashboardurl" . }}`}}'
+    - type: button
+      text: ':no_bell: Silence'
+      url: '{{`{{ template "__alert_silence_link" .}}`}}'
+      style: '{{`{{ if eq .Status "firing" }}danger{{ else }}default{{ end }}`}}'
+
+- name: team_atlas_slack
+  slack_configs:
+  {{- if eq .Values.managementCluster.pipeline "stable" }}
+  - channel: '#alert-atlas'
+  {{- else }}
+  - channel: '#alert-atlas-test'
+  {{- end }}
+    http_config:
+      {{- if .Values.alerting.slackAPIToken }}
+      authorization:
+        type: Bearer
+        credentials: {{ .Values.alerting.slackAPIToken }}
+      {{- end }}
+      proxy_from_environment: true
+    send_resolved: true
+    actions: *slack-actions
+
+- name: team_phoenix_slack
+  slack_configs:
+  {{- if eq .Values.managementCluster.pipeline "stable" }}
+  - channel: '#alert-phoenix'
+  {{- else }}
+  - channel: '#alert-phoenix-test'
+  {{- end }}
+    http_config:
+      {{- if .Values.alerting.slackAPIToken }}
+      authorization:
+        type: Bearer
+        credentials: {{ .Values.alerting.slackAPIToken }}
+      {{- end }}
+      proxy_from_environment: true
+    send_resolved: true
+    actions: *slack-actions
+
+- name: team_bigmac_slack
+  slack_configs:
+  {{- if eq .Values.managementCluster.pipeline "stable" }}
+  - channel: '#alert-bigmac'
+  {{- else }}
+  - channel: '#alert-bigmac-test'
+  {{- end }}
+    http_config:
+      {{- if .Values.alerting.slackAPIToken }}
+      authorization:
+        type: Bearer
+        credentials: {{ .Values.alerting.slackAPIToken }}
+      {{- end }}
+      proxy_from_environment: true
+    send_resolved: true
+    actions: *slack-actions
+
+- name: team_rocket_slack
+  slack_configs:
+  {{- if eq .Values.managementCluster.pipeline "stable" }}
+  - channel: '#alert-rocket'
+  {{- else }}
+  - channel: '#alert-rocket-test'
+  {{- end }}
+    http_config:
+      {{- if .Values.alerting.slackAPIToken }}
+      authorization:
+        type: Bearer
+        credentials: {{ .Values.alerting.slackAPIToken }}
+      {{- end }}
+      proxy_from_environment: true
+    send_resolved: true
+    actions: *slack-actions
+
+- name: team_shield_slack
+  slack_configs:
+  - channel: '#alert-shield'
+    http_config:
+      {{- if .Values.alerting.slackAPIToken }}
+      authorization:
+        type: Bearer
+        credentials: {{ .Values.alerting.slackAPIToken }}
+      {{- end }}
+      proxy_from_environment: true
+    send_resolved: true
+    actions: *slack-actions
+
+- name: team_turtles_slack
+  slack_configs:
+  {{- if eq .Values.managementCluster.pipeline "stable" }}
+  - channel: '#alert-turtles'
+  {{- else }}
+  - channel: '#alert-turtles-test'
+  {{- end }}
+    http_config:
+      {{- if .Values.alerting.slackAPIToken }}
+      authorization:
+        type: Bearer
+        credentials: {{ .Values.alerting.slackAPIToken }}
+      {{- end }}
+      proxy_from_environment: true
+    send_resolved: true
+    actions: *slack-actions
+
+- name: team_tenet_slack
+  slack_configs:
+  - channel: '#alert-tenet'
+    http_config:
+      {{- if .Values.alerting.slackAPIToken }}
+      authorization:
+        type: Bearer
+        credentials: {{ .Values.alerting.slackAPIToken }}
+      {{- end }}
+      proxy_from_environment: true
+    send_resolved: true
+    actions: *slack-actions
+
+- name: team_honeybadger_slack
+  slack_configs:
+  - channel: '#alert-honeybadger'
+    http_config:
+      {{- if .Values.alerting.slackAPIToken }}
+      authorization:
+        type: Bearer
+        credentials: {{ .Values.alerting.slackAPIToken }}
+      {{- end }}
+      proxy_from_environment: true
+    send_resolved: true
+    actions: *slack-actions
+
+- name: opsgenie_router
+  opsgenie_configs:
+  - api_key: {{ .Values.monitoring.opsgenieApiKey }}
+    tags: '{{`{{ (index .Alerts 0).Labels.alertname }},{{ (index .Alerts 0).Labels.cluster_type }},{{ (index .Alerts 0).Labels.severity }},{{ (index .Alerts 0).Labels.team }},{{ (index .Alerts 0).Labels.area }},{{ (index .Alerts 0).Labels.service_priority }},{{ (index .Alerts 0).Labels.provider }},{{ (index .Alerts 0).Labels.installation }},{{ (index .Alerts 0).Labels.pipeline }},{{ (index .Alerts 0).Labels.customer }}`}}'
+
+inhibit_rules:
+- source_matchers:
+  - inhibit_kube_state_metrics_down=true
+  target_matchers:
+  - cancel_if_kube_state_metrics_down=true
+  equal: [cluster_id]
+
+- source_matchers:
+  - inhibit_kube_state_metrics_down=true
+  - cluster_id={{ .Values.managementCluster.name }}
+  target_matchers:
+  - cancel_if_mc_kube_state_metrics_down=true
+
+- source_matchers:
+  - inhibit_kube_state_metrics_down=true
+  target_matchers:
+  - cancel_if_any_kube_state_metrics_down=true
+
+- source_matchers:
+  - cluster_status_creating=true
+  target_matchers:
+  - cancel_if_cluster_status_creating=true
+  equal: [cluster_id]
+
+- source_matchers:
+  - cluster_status_created=true
+  target_matchers:
+  - cancel_if_cluster_status_created=true
+  equal: [cluster_id]
+
+- source_matchers:
+  - cluster_status_updating=true
+  target_matchers:
+  - cancel_if_cluster_status_updating=true
+  equal: [cluster_id]
+
+- source_matchers:
+  - cluster_status_updated=true
+  target_matchers:
+  - cancel_if_cluster_status_updated=true
+  equal: [cluster_id]
+
+- source_matchers:
+  - cluster_status_deleting=true
+  target_matchers:
+  - cancel_if_cluster_status_deleting=true
+  equal: [cluster_id]
+
+- source_matchers:
+  - cluster_with_no_nodepools=true
+  target_matchers:
+  - cancel_if_cluster_with_no_nodepools=true
+  equal: [cluster_id]
+
+- source_matchers:
+  - cluster_with_scaling_nodepools=true
+  target_matchers:
+  - cancel_if_cluster_with_scaling_nodepools=true
+  equal: [cluster_id]
+
+- source_matchers:
+  - cluster_with_notready_nodepools=true
+  target_matchers:
+  - cancel_if_cluster_with_notready_nodepools=true
+  equal: [cluster_id]
+
+- source_matchers:
+  - cluster_control_plane_unhealthy=true
+  target_matchers:
+  - cancel_if_cluster_control_plane_unhealthy=true
+  equal: [cluster_id]
+
+- source_matchers:
+  - cluster_control_plane_unhealthy=true
+  target_matchers:
+  - cancel_if_any_cluster_control_plane_unhealthy=true
+
+- source_matchers:
+  - instance_state_not_running=true
+  target_matchers:
+  - cancel_if_instance_state_not_running=true
+  equal: [node]
+
+- source_matchers:
+  - kiam_has_errors=true
+  target_matchers:
+  - cancel_if_kiam_has_errors=true
+  equal: [cluster_id]
+
+- source_matchers:
+  - kubelet_down=true
+  target_matchers:
+  - cancel_if_kubelet_down=true
+  equal: [cluster_id, ip]
+
+- source_matchers:
+  - control_plane_node_down=true
+  target_matchers:
+  - cancel_if_control_plane_node_down=true
+  equal: [cluster_id]
+
+- source_matchers:
+  - outside_working_hours=true
+  target_matchers:
+  - cancel_if_outside_working_hours=true
+
+- source_matchers:
+  - has_worker_nodes=false
+  target_matchers:
+  - cancel_if_cluster_has_no_workers=true
+  equal: [cluster_id]
+
+- source_matchers:
+    - cluster_is_not_running_monitoring_agent=true
+  target_matchers:
+    - cancel_if_cluster_is_not_running_monitoring_agent=true
+  equal: [cluster_id]
+
+- source_matchers:
+    - inhibit_monitoring_agent_down=true
+  target_matchers:
+    - cancel_if_monitoring_agent_down=true
+  equal: [cluster_id]
+
+- source_matchers:
+    - stack_failed=true
+  target_matchers:
+    - cancel_if_stack_failed=true
+
+# Source: https://github.com/giantswarm/prometheus-rules/blob/main/helm/prometheus-rules/templates/kaas/turtles/alerting-rules/inhibit.nodes.rules.yml
+- source_matchers:
+    - node_not_ready=true
+  target_matchers:
+    - cancel_if_node_not_ready=true
+  equal: [cluster_id, node]
+
+# Source: https://github.com/giantswarm/prometheus-rules/blob/main/helm/prometheus-rules/templates/kaas/turtles/alerting-rules/inhibit.nodes.rules.yml
+- source_matchers:
+    - node_unschedulable=true
+  target_matchers:
+    - cancel_if_node_unschedulable=true
+  equal: [cluster_id, node]
diff --git a/helm/observability-operator/files/alertmanager/notification-template.tmpl b/helm/observability-operator/files/alertmanager/notification-template.tmpl
new file mode 100644
index 00000000..15aba095
--- /dev/null
+++ b/helm/observability-operator/files/alertmanager/notification-template.tmpl
@@ -0,0 +1,56 @@
+{{ define "__alertmanager" }}Alertmanager{{ end }}
+
+{{ define "slack.default.title" }}{{ .Status | toUpper }}[{{ if eq .Status "firing" }}{{ .Alerts.Firing | len }}{{- else }}{{ .Alerts.Resolved | len }}{{- end }}] {{ (index .Alerts 0).Labels.alertname }} - Team {{ (index .Alerts 0).Labels.team }}{{ end }}
+{{ define "slack.default.username" }}{{ template "__alertmanager" . }}{{ end }}
+{{ define "slack.default.fallback" }}{{ template "slack.default.title" . }} | {{ template "slack.default.titlelink" . }}{{ end }}
+{{ define "slack.default.pretext" }}{{ end }}
+{{ define "slack.default.titlelink" }}{{ template "__alerturl" . }}{{ end }}
+{{ define "slack.default.iconemoji" }}{{ end }}
+{{ define "slack.default.iconurl" }}{{ end }}
+{{ define "slack.default.text" }}*Cluster:* {{ (index .Alerts 0).Labels.installation }}{{ if (index .Alerts 0).Labels.cluster_id }} / {{ (index .Alerts 0).Labels.cluster_id }}{{ end }}{{ if (index .Alerts 0).Labels.service }} / {{ (index .Alerts 0).Labels.service }}{{ end }}
+*Area:* {{ (index .Alerts 0).Labels.area }} / {{ (index .Alerts 0).Labels.topic }}
+{{- if (index .Alerts 0).Annotations.description }}
+*Instances*
+{{ if eq .Status "firing" }}
+{{ range .Alerts.Firing }}
+:fire: {{ if .Labels.instance }}{{ .Labels.instance }}: {{ end }}{{ .Annotations.description }}{{- end }}
+{{ else }}
+{{ range .Alerts.Resolved }}
+:success: {{ if .Labels.instance }}{{ .Labels.instance }}: {{ end }}{{ .Annotations.description }}{{- end }}
+{{ end }}
+{{- end }}
+{{ end }}
+
+{{ define "opsgenie.default.message" }}{{ .GroupLabels.installation }} / {{ .GroupLabels.cluster_id }}{{ if (index .Alerts 0).Labels.service }} / {{ (index .Alerts 0).Labels.service }}{{ end }} - {{ index (index .Alerts.Firing 0).Labels `alertname`}}{{ end }}
+{{ define "opsgenie.default.source" }}{{ template "__alertmanager" . }}{{ end }}
+{{ define "opsgenie.default.description" -}}
+{{ if (index .Alerts 0).Annotations.opsrecipe -}}
+📗 Runbook: {{ template "__runbookurl" . }}
+{{ else -}}
+📗 Runbook: ⚠️ There is no **runbook** for this alert, time to get your pen.
+{{- end }}
+{{ if (index .Alerts 0).Annotations.dashboard -}}
+📈 Dashboard: {{ template "__dashboardurl" . }}
+{{ else -}}
+📈 Dashboard: ⚠️ There is no **dashboard** for this alert, time to sketch.
+{{ end -}}
+👀 Explore: {{ template "__alerturl" . }}
+🔔 Silence: {{ template "__alert_silence_link" . }}
+
+---
+
+* Team: {{ (index .Alerts 0).Labels.team }}
+* Area: {{ (index .Alerts 0).Labels.area }} / {{ (index .Alerts 0).Labels.topic }}
+* Instances:{{ range .Alerts.Firing }}
+🔥 {{ if .Labels.instance }}{{ .Labels.instance }}: {{ end }}{{ .Annotations.description }}{{ end }}
+{{- end }}
+
+# Link to the silence repository where silences should be created
+{{ define "__alert_silence_link" -}}
+https://github.com/giantswarm/silences#silences
+{{- end }}
+
+# Link to related PMs
+{{ define "__alert_linked_postmortems" -}}
+https://github.com/giantswarm/giantswarm/issues?q=is%3Aissue+is%3Aopen+label%3Apostmortem+label%3Aalert%2F{{ .CommonLabels.alertname }}
+{{- end }}
diff --git a/helm/observability-operator/files/alertmanager/url-template.tmpl.helm-template b/helm/observability-operator/files/alertmanager/url-template.tmpl.helm-template
new file mode 100644
index 00000000..d80d73fd
--- /dev/null
+++ b/helm/observability-operator/files/alertmanager/url-template.tmpl.helm-template
@@ -0,0 +1,21 @@
+{{`
+{{/*
+  __alerturl is the link pointing to a page in Grafana with details and source expressiong of the alert.
+*/}}
+{{ define "__alerturl" }}`}}{{ .Values.alerting.grafanaAddress }}{{`/alerting/Mimir/{{ .CommonLabels.alertname }}/find{{ end }}
+
+{{/*
+  __dashboardurl is the link pointing the Grafana dashboard referenced in the alert annotation if any.
+*/}}
+{{ define "__dashboardurl" -}}
+{{- if match "^https://.+" (index .Alerts 0).Annotations.dashboard }}{{ (index .Alerts 0).Annotations.dashboard -}}
+{{- else -}}
+`}}{{ .Values.alerting.grafanaAddress }}{{`/d/{{ (index .Alerts 0).Annotations.dashboard -}}
+{{- end -}}
+{{- end }}
+
+{{/*
+  __runbookurl is a link to the intranet's opsrecipe referenced in the alert annotation.
+*/}}
+{{ define "__runbookurl" -}}https://intranet.giantswarm.io/docs/support-and-ops/ops-recipes/{{ (index .Alerts 0).Annotations.opsrecipe }}{{- end }}
+`}}
diff --git a/helm/observability-operator/templates/alertmanager/secret.yaml b/helm/observability-operator/templates/alertmanager/secret.yaml
new file mode 100644
index 00000000..6c50a26a
--- /dev/null
+++ b/helm/observability-operator/templates/alertmanager/secret.yaml
@@ -0,0 +1,20 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  labels:
+    {{- include "labels.common" . | nindent 4 }}
+  name: {{ include "alertmanager-secret.name" . }}
+  namespace: {{ include "resource.default.namespace" . }}
+data:
+  {{- /* Template all .helm-template files found in files/alertmanager with values under alertmanager key */ -}}
+  {{ range $path, $_ :=  .Files.Glob  "files/alertmanager/*.helm-template" }}
+    {{ base $path | trimSuffix ".helm-template" }}: {{ tpl ($.Files.Get $path) $ | b64enc }}
+  {{ end }}
+
+  {{- /* Add all other non .helm-template files found in files/alertmanager */ -}}
+  {{ range $path, $_ :=  .Files.Glob  "files/alertmanager/*" }}
+  {{ if not (hasSuffix ".helm-template" $path) }}
+    {{ base $path }}: {{ ($.Files.Get $path) | b64enc }}
+  {{ end }}
+  {{ end }}
+type: Opaque
diff --git a/helm/observability-operator/values.yaml b/helm/observability-operator/values.yaml
index 981a52ce..7133bde1 100644
--- a/helm/observability-operator/values.yaml
+++ b/helm/observability-operator/values.yaml
@@ -19,7 +19,6 @@ alerting:
   enabled: false
   alertmanagerURL: ""
   grafanaAddress: ""
-  proxyURL: ""
   slackAPIToken: ""
   slackAPIURL: ""