keep 60 days by default

defaults/main.yml

@@ -4,7 +4,7 @@ fqdn: "{{inventory_hostname}}"
 domain_name: "{{fqdn|replace((ansible_hostname + '.'),'')}}"
 alertmanagers: "{{groups['alertmanager']}}"
 blackbox_exporters: "{{groups['blackbox_exporter']}}"
-prometheus_tsdb_retention_time: 90d
+prometheus_tsdb_retention_time: 60d
 prometheus_client_cn: "prometheus.{{domain_name}}"
 prometheus_federators: []
 prometheus_federator: False