add postgres exporter

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

roles/node_exporter/tasks/get_version.yml

@@ -10,9 +10,9 @@
 
 - name: Set version
   set_fact:
-    version: "{{ _github_release.json.tag_name
+    tag: "{{ _github_release.json.tag_name
       | regex_replace('^v?([0-9\\.]+)$', '\\1') }}"
 
 - name: Set download_url
   set_fact:
-    download_url: "https://github.com/prometheus/node_exporter/releases/download/v{{ version }}/node_exporter-{{ version }}.linux-{{ go_arch }}.tar.gz"
+    download_url: "https://github.com/prometheus/node_exporter/releases/download/v{{ tag }}/node_exporter-{{ tag }}.linux-{{ go_arch }}.tar.gz"

roles/node_exporter/tasks/install.yml

@@ -8,7 +8,7 @@
 
 - name: Move node_exporter into path
   copy:
-    src: "/tmp/node_exporter-{{ version }}.linux-{{ go_arch }}/node_exporter"
+    src: "/tmp/node_exporter-{{ tag }}.linux-{{ go_arch }}/node_exporter"
     dest: "{{ bin_path }}"
     mode: 755
     remote_src: true