Node exporter step "download and untar node_exporter tarball" is always "changed"

[Rudd-O]

TASK [ansible-prometheus : download and untar node_exporter tarball] ***********
changed: [hw01] => {"changed": true, "dest": "/opt/prometheus", "extract_results": {"cmd": ["/bin/tar", "--extract", "-C", "/opt/prometheus", "-z", "-f", "/tmp/ansible_IxDpGS/node_exporter-0.13.0.linux-amd64.tar.gz"], "err": "", "out": "", "rc": 0}, "gid": 1001, "group": "prometheus", "handler": "TgzArchive", "mode": "0750", "owner": "prometheus", "size": 4096, "src": "/tmp/ansible_IxDpGS/node_exporter-0.13.0.linux-amd64.tar.gz", "state": "directory", "uid": 1001}

Happens every time the role runs. This should not be happening.

[vincemukiiri]

This seems to be the case for the tasks that download prometheus, node exporter and alert manager. There should be a test to check whether they are already installed in which case there is no need to download them.