FS loop alerter

default alarmdef rule (commented) for fs space usage alerts

##############################################################################
#
# This alarm monitors two file systems and sends an alert when the space
# utilization on a given filesystem exceeds the given value.
#
# Initialize the variables root_util and var_util which will hold the
# current FS_SPACE_UTIL value.  The first time they are accessed, they will
# be initialized to zero.  Loop through the filesystem each interval and save
# the FS_SPACE_UTIL for each one.  Send an alert if the space utilization
# exceeds the given threshold.  A repeat alert will be sent every 30 minutes
# for as long as the threshold is exceeded.
#
# Note how alert and print syntac allows you to format numeric values with
# the optional parameters [|width|decimals].  The values will be right
# justified by default.  To left justify the field, add a "-" character
# before the width parameter.
#
##
# root_util = root_util
# var_util  = var_util
#
# FILESYSTEM LOOP
# {
#   if FS_DIRNAME == "/" then
#     root_util = FS_SPACE_UTIL
#
#   if FS_DIRNAME == "/var" then
#     var_util = FS_SPACE_UTIL
# }
#
# alarm root_util > 90 for 10 minutes
#   start
#     yellow alert "root filesys space util too high at ", root_util|3|2, "%"
#   repeat every 30 minutes
#     red alert    "root fs space is still too high at ", root_util|-3|2, "%"
#   end
#     reset alert  "root space util below the threshold"
#
# alarm var_util > 75 for 10 minutes
#   start
#     yellow alert "/var space util is too high at ", var_util|3|2, "%"
#   repeat every 30 minutes
#     red alert    "/var space util is still too high at ", var_util|3|2, "%"
#   end
#     reset alert  "/var space util now below the threshold"