Adding initial examples for alertmananger

docs/examples/alertmanager-encore.md

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+
+The following example describes configuration options to send alerts via alertmanager to
+Rackspace encore, the `Encore UUID` is derived by account where the secret `SECRET KEY` is
+used per application submitting webhooks:
+
+```yaml
+global:
+  resolve_timeout: 5m
+receivers:
+- name: default-receiver
+- name: watchman-webhook
+- name: critical-alert-manager-handler
+  webhook_configs:
+  - url: https://watchman.api.manage.rackspace.com/v1/mpk:<ENCORE UUID>/webhook/mpk-alertmanager?secret=<SECRET KEY>&severity=high
+  - url: http://prometheus-msteams.rackspace-system.svc:2000/critical
+- name: warning-alert-manager-handler
+  webhook_configs:
+    - url: http://prometheus-msteams.rackspace-system.svc:2000/warning
+route:
+  group_by:
+  - alertname
+  - severity
+  - cluster
+  - region
+  group_wait: 10s
+  group_interval: 5m
+  repeat_interval: 12h
+  receiver: watchman-webhook
+  routes:
+  - match:
+      severity: critical
+    receiver: watchman-webhook
+    routes:
+    - match_re:
+        namespace: kube-system|rackspace-system
+      receiver: critical-alert-manager-handler
+  #- match_re:
+  #    severity: warning
+  #  receiver: watchman-webhook
+  #  routes:
+  #  - match_re:
+  #      namespace: kube-system|rackspace-system
+  #    receiver: warning-alert-manager-handler
+```

docs/examples/alertmanager-slack.md

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+
+The following example describes configuration options to send alerts via alertmanager to slack
+using a slack hook.
+
+```yaml
+alertmanager:
+  alertmanagerSpec:
+    image:
+      repository: docker.io/prom/alertmanager:v0.20.0
+  config:
+    global:
+      resolve_timeout: 5m
+    receivers:
+    - name: default-receiver
+    - name: watchman-webhook
+    - name: warning-alert-manager-handler
+      slack_configs:
+      - api_url: https://hooks.slack.com/services/<slackwebhookhere>
+        channel: '#<slack-channel here>'
+        send_resolved: true
+        text: >-
+          {{- if .CommonAnnotations.summary -}}
+            *Summary*: {{- .CommonAnnotations.summary -}}{{- "\n" -}}
+          {{- else if .CommonAnnotations.description -}}
+            *Description*: {{- .CommonAnnotations.description -}}{{- "\n" -}}
+          {{- else if .CommonAnnotations.message -}}
+            *Message*: {{- .CommonAnnotations.message -}}{{- "\n" -}}
+          {{- end -}}
+          *Cluster*: {{ .GroupLabels.cluster }}
+          *Wiki*: https://desired.wiki.page/{{ .GroupLabels.alertname }}
+    route:
+      group_by:
+      - alertname
+      - severity
+      - cluster
+      - region
+      group_interval: 5m
+      group_wait: 10s
+      receiver: watchman-webhook
+      repeat_interval: 12h
+      routes:
+      - match_re:
+          severity: critical
+        receiver: warning-alert-manager-handler
+```