ceph-dashboard-* jobs: Install Prometheus and Alertmanager

In order to test the alert configuration within the dashboard
(e2e tests) we need to have Prometheus and Alertmanager running
on the system. Added a new script which takes care of the installation
and running Prometheus and Alertmanager in the background.
Added the script only to the dashboard e2e Jenkins job (for the time being),
the processes will be killed at the end of the job.

Signed-off-by: Laura Paduano <[email protected]>

ceph-dashboard-pull-requests/config/definitions/ceph-dashboard-pull-requests.yml

@@ -62,4 +62,6 @@
       - shell:
           !include-raw:
             - ../../../scripts/dashboard/install-e2e-test-deps.sh
+            - ../../../scripts/dashboard/install-prometheus-and-alertmanager.sh  
       - shell: "cd src/pybind/mgr/dashboard; timeout 7200 ./run-frontend-e2e-tests.sh"
+      - shell: pkill prometheus && pkill alertmanager

scripts/dashboard/install-prometheus-and-alertmanager.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -ex
+
+# Install and run Prometheus
+# Use $WORKSPACE dir since it will be wiped after the job has completed
+cd $WORKSPACE
+sudo mkdir prometheus
+cd prometheus
+sudo curl -LO https://github.com/prometheus/prometheus/releases/download/v2.15.2/prometheus-2.15.2.linux-amd64.tar.gz
+sudo tar xf prometheus-2.15.2.linux-amd64.tar.gz
+cd prometheus/prometheus-2.15.2.linux-amd64
+
+sudo ./prometheus &
+
+cd $WORKDIR
+
+# Install and run Alertmanager
+sudo mkdir alertmanager
+cd alertmanager
+sudo curl -LO https://github.com/prometheus/alertmanager/releases/download/v0.20.0/alertmanager-0.20.0.linux-amd64.tar.gz
+sudo tar xf alertmanager-0.20.0.linux-amd64.tar.gz
+cd alertmanager/alertmanager-0.20.0.linux-amd64
+
+sudo ./alertmanager &
+
+# "pkill prometheus" and "pkill alertmanager" must be executed in the Jenkins job that uses this script