IGA V15.0
To resolve the issue, follow the steps below
Take a copy of SiteMinderHeaders.properties from /opt/brcm/iga/inst/idm/iam_im.ear/config/com/netegrity/config or <app_server>/standalone/deployments/iam_im.ear/config/com/netegrity/config
Add your custom headers to the last part of this file.
Rename this file to headers.properties,
keep this new file in/opt/brcm/iga/conf/idm/siteminder location.
Restart the application server.
Validate your changes to <app_server>/standalone/deployments/iam_im.ear/config/com/netegrity/config/SiteMinderHeaders.properties
Now we can find the IP address in the Audit logs