CP-12640: Generate alert when log partition is full

Signed-off-by: Sharad Yadav <[email protected]>

Author: sharady

scripts/perfmon

@@ -345,18 +345,32 @@ class RRDUpdates:
 
 
 # Consolidation functions:
-supported_consolidation_functions = [ 'sum', 'average', 'max', 'get_percent_fs_usage', 'get_percent_mem_usage' ]
+supported_consolidation_functions = [ 'sum', 'average', 'max', 'get_percent_fs_usage', 'get_percent_log_fs_usage', 'get_percent_mem_usage' ]
 
 def average(mylist):
     return sum(mylist)/float(len(mylist))
 
+def get_percent_log_fs_usage(ignored):
+    "Get the percent usage of the host filesystem for logs partition. Input list is ignored and should be empty"
+    fs_output = commands.getoutput('df /etc/passwd')
+    log_fs_output = commands.getoutput('df /var/log')
+    fs_output = ' '.join(fs_output.splitlines()[1:])
+    log_fs_output = ' '.join(log_fs_output.splitlines()[1:])
+    # Get the percent usage only when there is a separate logs partition
+    if (fs_output.split()[0] != log_fs_output.split()[0]):
+        percentage = log_fs_output.split()[4]
+        # remove % character and convert to float
+        return float(percentage[0:-1])/100.0
+    else:
+        return float('NaN')
+
 def get_percent_fs_usage(ignored):
     "Get the percent usage of the host filesystem.  Input list is ignored and should be empty"
     # this file is on the filesystem of interest in both OEM and Retail
     output = commands.getoutput('df /etc/passwd')
     output = ' '.join(output.splitlines()[1:]) # remove header line and rewrap on single line
     percentage = output.split()[4]
-    # strip of % character and convert to float
+    # remove % character and convert to float
     return float(percentage[0:-1])/100.0
 
 def get_percent_mem_usage(ignored):
@@ -643,7 +657,7 @@ class VMMonitor(ObjectMonitor):
        * alarm_trigger_period: num seconds of 'bad' values before an alarm is sent (default '60')
        * alarm_auto_inhibit_period: num seconds this alarm disabled after an alarm is sent (default '3600')
        * consolidation_fn: how to combine variables from rrd_updates into one value
-         (default is 'average' for 'cpu_usage', 'get_percent_fs_usage' for 'fs_usage', 'get_percent_mem_usage' for 'mem_usage', & 'sum' for everything else)
+         (default is 'average' for 'cpu_usage', 'get_percent_fs_usage' for 'fs_usage', 'get_percent_log_fs_usage' for 'log_fs_usage', 'get_percent_mem_usage' for 'mem_usage', & 'sum' for everything else)
        * rrd_regex matches the names of variables from (xe vm-data-sources-list uuid=$vmuuid) used to compute value
          (only has defaults for "cpu_usage", "network_usage", and "disk_usage")
     """
@@ -657,19 +671,22 @@ class VMMonitor(ObjectMonitor):
         if config_tag == 'consolidation_fn':
             if variable_name == "cpu_usage": return 'average'
             elif variable_name == "fs_usage": return 'get_percent_fs_usage'
+            elif variable_name == "log_fs_usage": return 'get_percent_log_fs_usage'
             elif variable_name == "mem_usage": return 'get_percent_mem_usage'
             else: return 'sum'
         elif config_tag == 'rrd_regex':
             if variable_name == "cpu_usage": return "cpu[0-9]+"
             elif variable_name == "network_usage": return "vif_[0-9]+_[rt]x"
             elif variable_name == "disk_usage": return "vbd_(xvd|hd)[a-z]+_(read|write)"
             elif variable_name == "fs_usage": return "_$_DUMMY__"     # match nothing
+            elif variable_name == "log_fs_usage": return "_$_DUMMY__" # match nothing
             elif variable_name == "mem_usage": return "_$_DUMMY__"    # match nothing
             else: raise XmlConfigException, "variable %s: no default rrd_regex - please specify one" % variable_name
         elif config_tag == 'alarm_trigger_period':      return '60'   # 1 minute
         elif config_tag == 'alarm_auto_inhibit_period': return '3600' # 1 hour
         elif config_tag == 'alarm_trigger_level': 
             if variable_name == "fs_usage": return '0.9'              # trigger when 90% full
+            elif variable_name == "log_fs_usage": return '0.9'        # trigger when 90% full
             elif variable_name == "mem_usage": return '0.95'          # tigger when mem demanded is close to phy_mem
             else: raise XmlConfigException, "variable %s: no default alarm_trigger_level - please specify one" % variable_name
         elif config_tag == 'alarm_trigger_sense':       return 'high' # trigger if *above*