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We have two mechanisms that remove old coredumps: systemd-coredump has parameters based on disk use / remaining disk free, and systemd-tmpfiles does cleanup based on time. The first mechanism should prevent us from using too much disk space in case something is crashing continuously or there are very large core files. The limit of 3 days makes it likely that the core file will be gone by the time the admin looks at the issue. E.g. if something crashes on Friday, the coredump would likely be gone before people are back on Monday to look at it.
Files in this directory contain configuration for systemd-tmpfiles, a program to create, delete, and clean up volatile and temporary files and directories. See man:tmpfiles.d(5) for explanation of the configuration file format, and man:systemd-tmpfiles(8) for a description of when and how this configuration is applied. Use 'systemd-analyze cat-config tmpfiles.d' to display the effective config.