filename may also be a directory in which case, the filename is
                   generated from the PID and the current date in the specified
                   directory. (FILE, no default value)

                   Note: If a filename is given, '%p' in the filename will be
                   replaced by the PID, and '%t' will be replaced by the time in
                   'yyyy_MM_dd_HH_mm_ss' format.

  maxage           (Optional) Maximum time to keep the recorded data on disk. This
                   parameter is valid only when the disk parameter is set to true.
                   Note 0s means forever. (INT followed by 's' for seconds 'm'
                   for minutes or 'h' for hours, 0s)

  maxsize          (Optional) Maximum size of the data to keep on disk in bytes if
                   one of the following suffixes is not used: 'm' or 'M' for
                   megabytes OR 'g' or 'G' for gigabytes. This parameter is valid
                   only when the disk parameter is set to 'true'. The value must not
                   be less than the value for the maxchunksize parameter set with
                   the JFR.configure command. (STRING, 0 (no max size))

  name             (Optional) Name of the recording. If no name is provided, a name
                   is generated. Make note of the generated name that is shown in
                   the response to the command so that you can use it with other
                   commands. (STRING, system-generated default name)

  path-to-gc-roots (Optional) Flag for saving the path to garbage collection (GC)
                   roots at the end of a recording. The path information is useful
                   for finding memory leaks but collecting it is time consuming.
                   Turn on this flag only when you have an application that you
                   suspect has a memory leak. If the settings parameter is set to
                   'profile', then the information collected includes the stack
                   trace from where the potential leaking object was allocated.
                   (BOOLEAN, false)

  settings         (Optional) Name of the settings file that identifies which events
                   to record. To specify more than one file, use the settings
                   parameter repeatedly. Include the path if the file is not in
                   JAVA-HOME/lib/jfr. The following profiles are included with the
                   JDK in the JAVA-HOME/lib/jfr directory: 'default.jfc': collects a
                   predefined set of information with low overhead, so it has minimal
                   impact on performance and can be used with recordings that run
                   continuously; 'profile.jfc': Provides more data than the
                   'default.jfc' profile, but with more overhead and impact on
                   performance. Use this configuration for short periods of time
                   when more information is needed. Use none to start a recording
                   without a predefined configuration file. (STRING,
                   JAVA-HOME/lib/jfr/default.jfc)

Event settings and .jfc options can also be specified using the following syntax:

  jfc-option=value    (Optional) The option value to modify. To see available
                      options for a .jfc file, use the 'jfr configure' command.

  event-setting=value (Optional) The event setting value to modify. Use the form:
                      <event-name>#<setting-name>=<value>
                      To add a new event setting, prefix the event name with '+'.

In case of a conflict between a parameter and a .jfc option, the parameter will
take  precedence. The whitespace character can be omitted for timespan values,
i.e. 20s. For more information about the settings syntax, see Javadoc of the
jdk.jfr package.
$JFC_OPTIONS
Options must be specified using the <key> or <key>=<value> syntax. Multiple
options are separated with a $DELIMITER_NAME.

Example usage:

 $SOURCE_NO_ARGUMENTS
 $SOURCEfilename=dump.jfr
 $SOURCEfilename=$DIRECTORY
 $SOURCEdumponexit=true
 $SOURCEmaxage=1h$DELIMITERmaxsize=1000M
 $SOURCEsettings=profile
 $SOURCEdelay=5m$DELIMITERsettings=my.jfc
 $SOURCEgc=high$DELIMITERmethod-profiling=high
 $SOURCEjdk.JavaMonitorEnter#threshold=1ms
 $SOURCE+HelloWorld#enabled=true$DELIMITER+HelloWorld#stackTrace=true
 $SOURCEsettings=user.jfc$DELIMITERcom.example.UserDefined#enabled=true
 $SOURCEsettings=none$DELIMITER+Hello#enabled=true

Note, if the default event settings are modified, overhead may exceed 1%.