Remove unused files

Prometheus/Alertmanager are configured in the faas-netes repo
for use in Kubernetes. These files are not required.

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

prometheus/Dockerfile.alertmanager.k8s

-FROM prom/alertmanager:v0.7.1
-
-COPY k8s.alertmanager.yml /alertmanager.yml

prometheus/Dockerfile.prometheus.k8s

-FROM prom/prometheus:v1.5.2
-
-COPY k8s.prometheus.yml /etc/prometheus/prometheus.yml
-COPY k8s.alert.rules /etc/prometheus/alert.rules
-

prometheus/k8s.alert.rules

-ALERT service_down
-  IF up == 0
-
-ALERT APIHighInvocationRate
-  IF sum ( rate(gateway_function_invocation_total{code="200"}[10s]) ) by (function_name) > 5
-  FOR 5s
-  LABELS {
-    service = "gateway",
-    severity = "major",
-  }
-  ANNOTATIONS {
-    summary = "High invocation total on {{ $labels.function_name }}",
-    description =  "High invocation total on {{ $labels.function_name }}"
-  }
-

prometheus/k8s.alertmanager.yml

-global:
-  # The smarthost and SMTP sender used for mail notifications.
-  smtp_smarthost: 'localhost:25'
-  smtp_from: 'alertmanager@example.org'
-  smtp_auth_username: 'alertmanager'
-  smtp_auth_password: 'password'
-  # The auth token for Hipchat.
-  hipchat_auth_token: '1234556789'
-  # Alternative host for Hipchat.
-  hipchat_url: 'https://hipchat.foobar.org/'
-
-# The directory from which notification templates are read.
-templates: 
-- '/etc/alertmanager/template/*.tmpl'
-
-# The root route on which each incoming alert enters.
-route:
-  # The labels by which incoming alerts are grouped together. For example,
-  # multiple alerts coming in for cluster=A and alertname=LatencyHigh would
-  # be batched into a single group.
-  group_by: ['alertname', 'cluster', 'service']
-
-  # When a new group of alerts is created by an incoming alert, wait at
-  # least 'group_wait' to send the initial notification.
-  # This way ensures that you get multiple alerts for the same group that start
-  # firing shortly after another are batched together on the first 
-  # notification.
-  group_wait: 5s
-
-  # When the first notification was sent, wait 'group_interval' to send a batch
-  # of new alerts that started firing for that group.
-  group_interval: 10s
-
-  # If an alert has successfully been sent, wait 'repeat_interval' to
-  # resend them.
-  repeat_interval: 30s 
-
-  # A default receiver
-  receiver: scale-up
-
-  # All the above attributes are inherited by all child routes and can 
-  # overwritten on each.
-
-  # The child route trees.
-  routes:
-  - match:
-      service: gateway
-      receiver: scale-up
-      severity: major
-
-
-# Inhibition rules allow to mute a set of alerts given that another alert is
-# firing.
-# We use this to mute any warning-level notifications if the same alert is 
-# already critical.
-inhibit_rules:
-- source_match:
-    severity: 'critical'
-  target_match:
-    severity: 'warning'
-  # Apply inhibition if the alertname is the same.
-  equal: ['alertname', 'cluster', 'service']
-
-receivers:
-- name: 'scale-up'
-  webhook_configs:
-    - url: http://gateway.default:8080/system/alert
-      send_resolved: true
-

prometheus/k8s.prometheus.yml

-# my global config
-global:
-  scrape_interval:     15s # By default, scrape targets every 15 seconds.
-  evaluation_interval: 15s # By default, scrape targets every 15 seconds.
-  # scrape_timeout is set to the global default (10s).
-
-  # Attach these labels to any time series or alerts when communicating with
-  # external systems (federation, remote storage, Alertmanager).
-  external_labels:
-      monitor: 'faas-monitor'
-
-# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
-rule_files:
-    - 'alert.rules'
-
-
-# A scrape configuration containing exactly one endpoint to scrape:
-# Here it's Prometheus itself.
-scrape_configs:
-  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
-  - job_name: 'prometheus'
-
-    # Override the global default and scrape targets from this job every 5 seconds.
-    scrape_interval: 5s
-
-    # metrics_path defaults to '/metrics'
-    # scheme defaults to 'http'.
-    static_configs:
-      - targets: ['localhost:9090']
-
-  - job_name: "gateway"
-    scrape_interval: 5s
-    dns_sd_configs:
-      - names: ['gateway.default.svc.cluster.local']
-        port: 8082
-        type: A
-        refresh_interval: 5s