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roles/logging_rsyslog/files/README.md

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+Place the customer's internal CA root/intermediate certificate here
+(filename set via syslog_ca_cert_src in group_vars, default: siem-ca.crt),
+unless the SIEM/syslog-collector certificate is already signed by a
+publicly trusted CA already present in the system trust store.
+
+Only relevant when syslog_ca_cert_enabled: true.