[PLAT-14495] Set up the node_exporter for ynp

Summary: Configure node_exporter module for ynp

Test Plan:
Manually tried provisioing node via YNP. Verified node_exporter is running post the
script execution.

Reviewers: anijhawan, nbhatia

Reviewed By: anijhawan

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D36115

managed/node-agent/resources/ynp/configs/config.j2

@@ -60,3 +60,7 @@ locks = unlimited
 [InstallNodeAgent]
 {{ render_section(yba) -}}
 yb_user = {{ ynp.yb_user }}
+
+[ConfigureNodeExporter]
+prometheus_user = prometheus
+yb_home_dir = {{ ynp.yb_home_dir }}

managed/node-agent/resources/ynp/modules/provision/node_agent/templates/node_agent_run.j2

@@ -7,7 +7,7 @@ airgap_flag=""
 {% endif %}
 
 installer_dir="{{ ynp_dir }}/../../bin"
-sudo su - {{ yb_user }} -c "\"$installer_dir/node-agent-installer.sh\" -c install -u {{ url }} -t {{ api_key }} --provider_id {{ provider_id }}  --instance_type {{ instance_type_name }} --zone_name {{ provider_region_zone_name }} --node_name {{ node_name }} --node_ip {{ node_ip }} --silent --skip_verify_cert $airgap_flag"
+su - {{ yb_user }} -c "\"$installer_dir/node-agent-installer.sh\" -c install -u {{ url }} -t {{ api_key }} --provider_id {{ provider_id }}  --instance_type {{ instance_type_name }} --zone_name {{ provider_region_zone_name }} --node_name {{ node_name }} --node_ip {{ node_ip }} --silent --skip_verify_cert $airgap_flag"
 
 # install node_agent service
 "$installer_dir/node-agent-installer.sh" -c install_service --user yugabyte

managed/node-agent/resources/ynp/modules/provision/node_exporter/node_exporter.py

@@ -0,0 +1,7 @@
+from ...base_module import BaseYnpModule
+
+
+class ConfigureNodeExporter(BaseYnpModule):
+
+    run_template = "node_exporter_run.j2"
+    precheck_template = "node_exporter_precheck.j2"

managed/node-agent/resources/ynp/modules/provision/node_exporter/templates/node_exporter_precheck.j2

@@ -0,0 +1,10 @@
+service_name="node_exporter.service"
+
+# Get the status of node_exporter Service
+status=$(systemctl show -p ActiveState "$service_name" | grep ActiveState | awk -F= '{print $2}')
+if [ "$status" = "active" ]; then
+    echo "\"$service_name\" is active"
+else
+    echo "\"$service_name\"  is not active"
+    exit 1
+fi

managed/node-agent/resources/ynp/modules/provision/node_exporter/templates/node_exporter_run.j2

@@ -0,0 +1,62 @@
+thirdparty_dir="{{ ynp_dir }}/../../thirdparty"
+
+# Setup the directories & permissions for prometheus user
+mkdir -p /opt/prometheus
+mkdir -p /etc/prometheus
+mkdir -p /var/log/prometheus
+mkdir -p /var/run/prometheus
+mkdir -p /tmp/yugabyte/metrics
+
+if [ -f "$thirdparty_dir/node_exporter-1.7.0.linux-amd64.tar.gz" ]; then
+    mv "$thirdparty_dir/node_exporter-1.7.0.linux-amd64.tar.gz" /opt/prometheus
+fi
+
+# Check if the user "prometheus" already exists
+if ! id -u prometheus >/dev/null 2>&1; then
+    adduser --shell /bin/bash prometheus
+fi
+
+# Set ownership and permissions
+chown -R prometheus:prometheus /opt/prometheus
+chown -R prometheus:prometheus /etc/prometheus
+chown -R prometheus:prometheus /var/log/prometheus
+chown -R prometheus:prometheus /var/run/prometheus
+chown -R yugabyte:yugabyte /tmp/yugabyte/metrics
+chmod -R 755 /tmp/yugabyte/metrics
+
+if [ -f /opt/prometheus/node_exporter-1.7.0.linux-amd64.tar.gz ]; then
+    chmod +r /opt/prometheus/node_exporter-1.7.0.linux-amd64.tar.gz
+
+    # Extract the node_exporter tarball
+    su - {{ prometheus_user }} -c "cd /opt/prometheus && tar zxf node_exporter-1.7.0.linux-amd64.tar.gz"
+fi
+
+# Configure Systemd Unit
+file_path="/etc/systemd/system/node_exporter.service"
+
+# Create the file and write the content
+cat <<EOL > $file_path
+[Unit]
+Description=node_exporter - Exporter for machine metrics.
+Documentation=https://github.com/William-Yeh/ansible-prometheus
+After=network.target
+
+[Install]
+WantedBy=multi-user.target
+
+[Service]
+Type=simple
+Restart=on-failure
+
+User=prometheus
+Group=prometheus
+
+ExecStart=/opt/prometheus/node_exporter-1.7.0.linux-amd64/node_exporter  --web.listen-address=:9300 --collector.textfile.directory={{ yb_home_dir }}/metrics
+EOL
+
+# Enable and start the node_exporter service
+systemctl daemon-reload
+systemctl enable node_exporter
+systemctl start node_exporter
+
+echo "Node exporter setup is complete."