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       system_information - System Information



       sanity_check() -> ok | {failed, Failures}


                 Application = atom()
                 ApplicationVersion = string()
                 MissingRuntimeDependencies =
                     {missing_runtime_dependencies, ApplicationVersion,
                 InvalidApplicationVersion =
                     {invalid_application_version, ApplicationVersion}
                 InvalidAppFile = {invalid_app_file, Application}
                 Failure =
                     MissingRuntimeDependencies | InvalidApplicationVersion |
                 Failures = [Failure]

              Performs  a sanity check on the system. If no issues were found, ok is returned. If
              issues were found, {failed, Failures} is returned. All failures found will be  part
              of the Failures list. Currently defined Failure elements in the Failures list:

                  An  application  has  an  invalid  .app file. The second element identifies the
                  application which has the invalid .app file.

                  An  application  has  an  invalid  application  version.  The  second   element
                  identifies the application version that is invalid.

                  An  application  is missing runtime dependencies. The second element identifies
                  the application (with version) that has missing dependencies. The third element
                  contains the missing dependencies.

                  Note  that  this  check  use  application  versions that are loaded, or will be
                  loaded when used. You  might  have  application  versions  that  satisfies  all
                  dependencies  installed  in  the system, but if those are not loaded this check
                  will fail. The system will of course also fail when used like  this.  This  may
                  happen  when  you  have  multiple  branched  versions  of  the same application
                  installed in the system, but you do  not  use  a  boot  script  identifing  the
                  correct application version.

              Currently  the  sanity  check is limited to verifying runtime dependencies found in
              the .app files of all applications. More checks will be introduced in  the  future.
              This implies that the return type will change in the future.

              An ok return value only means that sanity_check/0 did not find any issues, not that
              no issues exist.

       to_file(FileName) -> ok | {error, Reason}


                 FileName = file:name_all()
                 Reason = file:posix() | badarg | terminated | system_limit

              Writes miscellaneous system information to file. This information will typically be
              requested by the Erlang/OTP team at Ericsson AB when reporting an issue.