Rudder

If the minimum is 2 and maximum is 3, the result will be:

For a correct number of processes:

$ ps axf | grep sleep
24952 pts/0    S+     0:00              \_ grep sleep
24187 ?        S      0:00 /bin/sleep 3600
24209 ?        S      0:00 /bin/sleep 3600
24782 ?        S      0:00 /bin/sleep 3600

$ sudo /var/rudder/cfengine-community/bin/cf-agent -KIb process_management
 >> Using command line specified bundlesequence
 !! process_count and restart_class should not be used in the same promise as this makes no sense
Promise (version not specified) belongs to bundle 'check_process' in file '/var/rudder/cfengine-community/inputs/processManagement/1.1/processManagement.cf' near line 51
Comment: Enforcing process parameters
R: @@ProcessManagement@@log_info@@88853dba-63e4-45fe-8f1f-17cbd3801bd0@@4c12ea25-7637-44a2-b899-2c7229979e88@@2@@Process@@sleep@@2013-10-04 14:12:19+02:00##root@#sleep: the process instance count is out of the permitted range
R: @@ProcessManagement@@result_success@@88853dba-63e4-45fe-8f1f-17cbd3801bd0@@4c12ea25-7637-44a2-b899-2c7229979e88@@2@@Process@@sleep@@2013-10-04 14:12:19+02:00##root@#sleep: the process was in range (3-2)
 !! process_count and restart_class should not be used in the same promise as this makes no sense
Promise (version not specified) belongs to bundle 'check_process' in file '/var/rudder/cfengine-community/inputs/processManagement/1.1/processManagement.cf' near line 51
Comment: Enforcing process parameters
 !! process_count and restart_class should not be used in the same promise as this makes no sense
Promise (version not specified) belongs to bundle 'check_process' in file '/var/rudder/cfengine-community/inputs/processManagement/1.1/processManagement.cf' near line 51
Comment: Enforcing process parameters
 !! Method invoked repairs

For a number of processes over the range definied:

$ ps axf | grep sleep
25032 pts/0    S+     0:00              \_ grep sleep
24187 ?        S      0:00 /bin/sleep 3600
24209 ?        S      0:00 /bin/sleep 3600
24782 ?        S      0:00 /bin/sleep 3600
24803 ?        S      0:00 /bin/sleep 3600
24824 ?        S      0:00 /bin/sleep 3600

$ sudo /var/rudder/cfengine-community/bin/cf-agent -KIb process_management
 !! Duplicate selection of value for variable "execRun" in scope g
 !! Rule from /var/rudder/cfengine-community/inputs/processManagement/1.1/processManagement.cf at/before line 0
 >> Using command line specified bundlesequence
 !! process_count and restart_class should not be used in the same promise as this makes no sense
Promise (version not specified) belongs to bundle 'check_process' in file '/var/rudder/cfengine-community/inputs/processManagement/1.1/processManagement.cf' near line 51
Comment: Enforcing process parameters
R: @@ProcessManagement@@log_info@@88853dba-63e4-45fe-8f1f-17cbd3801bd0@@4c12ea25-7637-44a2-b899-2c7229979e88@@2@@Process@@sleep@@2013-10-04 14:12:32+02:00##root@#sleep: the process instance count is out of the permitted range
R: @@ProcessManagement@@result_success@@88853dba-63e4-45fe-8f1f-17cbd3801bd0@@4c12ea25-7637-44a2-b899-2c7229979e88@@2@@Process@@sleep@@2013-10-04 14:12:32+02:00##root@#sleep: the process was in range (3-2)
 !! process_count and restart_class should not be used in the same promise as this makes no sense
Promise (version not specified) belongs to bundle 'check_process' in file '/var/rudder/cfengine-community/inputs/processManagement/1.1/processManagement.cf' near line 51
Comment: Enforcing process parameters
 !! process_count and restart_class should not be used in the same promise as this makes no sense
Promise (version not specified) belongs to bundle 'check_process' in file '/var/rudder/cfengine-community/inputs/processManagement/1.1/processManagement.cf' near line 51
Comment: Enforcing process parameters
 !! Method invoked repairs

Then, a log_info will be displayed but no action will be applied.

This happens because we have both a restart class an process count in the same promise:

process_count and restart_class should not be used in the same promise as this makes no sense

The process count check is skipped in this case.

Testing with 2 to 3 sleep process, with 5 running
The message is

E| error         ServicesManagement        Advanced options          sleep              The process range for service sleep was not correct, but was repaired

so it does not return success, but the end of the message is confusing