Simplify AFD alarm field structure

The patche removes the transformation performed on the AFD table
fields: name=value -> {name='name', value='value'} -> name=value

This transformation is useless and ineffective because it allocates a table
for every field pair.
Furthermore, this prevents to access directly alarm.fields['field name']
for any further computation.

Change-Id: I7356ab5cf5975700ecf02a2a678871094a06cae9

deployment_scripts/puppet/modules/lma_collector/files/plugins/common/afd.lua

@@ -21,6 +21,7 @@ local consts = require 'gse_constants'
 local read_message = read_message
 local assert = assert
 local ipairs = ipairs
+local pairs = pairs
 local pcall = pcall
 local table = table
 
@@ -47,11 +48,11 @@ end
 -- for instance: "CPU load too high (WARNING, rule='last(load_midterm)>=5', current=7)"
 function get_alarm_for_human(alarm)
     local metric
-    if #(alarm.fields) > 0 then
     local fields = {}
-        for _, field in ipairs(alarm.fields) do
-            fields[#fields+1] = field.name .. '="' .. field.value .. '"'
+    for name, value in pairs(alarm.fields) do
+        fields[#fields+1] = name .. '="' .. value .. '"'
     end
+    if #fields > 0 then
         metric = string.format('%s[%s]', alarm.metric, table.concat(fields, ','))
     else
         metric = alarm.metric

deployment_scripts/puppet/modules/lma_collector/files/plugins/common/afd_alarm.lua

@@ -124,16 +124,6 @@ function Alarm:add_value(ts, metric, value, fields)
     end
 end
 
--- convert fields to fields map
--- {foo="bar"} --> {name="foo", value="bar"}
-local function convert_field_list(fields)
-    local named_fields = {}
-    for name, value in pairs(fields or {}) do
-        named_fields[#named_fields+1] = {name=name, value=value}
-    end
-    return named_fields
-end
-
 -- return: state of alarm and a list of alarm details.
 --
 -- with alarm list when state != OKAY:
@@ -179,7 +169,7 @@ function Alarm:evaluate(ns)
         end
         for _, context in ipairs(context_list) do
             add_alarm(rule, context.value, msg,
-                      convert_field_list(context.fields))
+                      context.fields)
         end
     end
 

deployment_scripts/puppet/modules/lma_collector/files/plugins/filters/afd_api_backends.lua

@@ -41,7 +41,7 @@ function process_message()
         afd.add_to_alarms(consts.DOWN,
                           'last',
                           metric_name,
-                          {{name='service',value=service},{name='state',value='up'}},
+                          {service=service,state='up'},
                           {},
                           '==',
                           haproxy_backend_states[service].up,
@@ -54,7 +54,7 @@ function process_message()
         afd.add_to_alarms(consts.CRIT,
                           'last',
                           metric_name,
-                          {{name='service',value=service},{name='state',value='down'}},
+                          {service=service,state='down'},
                           {},
                           '>=',
                           haproxy_backend_states[service].down,
@@ -67,7 +67,7 @@ function process_message()
         afd.add_to_alarms(consts.WARN,
                           'last',
                           metric_name,
-                          {{name='service',value=service},{name='state',value='down'}},
+                          {service=service,state='down'},
                           {},
                           '>',
                           haproxy_backend_states[service].down,

deployment_scripts/puppet/modules/lma_collector/files/plugins/filters/afd_workers.lua

@@ -45,7 +45,7 @@ function process_message()
         afd.add_to_alarms(consts.DOWN,
                           'last',
                           metric_name,
-                          {{name='service',value=service},{name='state',value='up'}},
+                          {service=service,state='up'},
                           {},
                           '==',
                           worker.up,
@@ -58,7 +58,7 @@ function process_message()
         afd.add_to_alarms(consts.CRIT,
                           'last',
                           metric_name,
-                          {{name='service',value=service},{name='state',value='down'}},
+                          {service=service,state='down'},
                           {},
                           '>=',
                           worker.down,
@@ -71,7 +71,7 @@ function process_message()
         afd.add_to_alarms(consts.WARN,
                           'last',
                           metric_name,
-                          {{name='service',value=service},{name='state',value='down'}},
+                          {service=service,state='down'},
                           {},
                           '>',
                           worker.down,

deployment_scripts/puppet/modules/lma_collector/tests/lua/test_afd.lua

@@ -95,7 +95,7 @@ TestAfd = {}
             severity='CRITICAL',
             ['function']='avg',
             metric='fs_space_percent_free',
-            fields={{name='fs',value='/'}},
+            fields={fs='/'},
             tags={},
             operator='<=',
             value=2,

deployment_scripts/puppet/modules/lma_collector/tests/lua/test_afd_alarm.lua

@@ -685,7 +685,7 @@ function TestLMAAlarm:test_rules_fields()
     local root_fs = lma_alarm.get_alarm('FS_root')
     local state, result = root_fs:evaluate(t)
     assertEquals(#result, 1)
-    assertItemsEquals(result[1].fields, {{name='fs', value='/'}})
+    assertItemsEquals(result[1].fields, {fs='/'})
     assertEquals(result[1].value, 8)
 
 
@@ -730,7 +730,7 @@ function TestLMAAlarm:test_rule_with_multivalue()
     lma_alarm.add_value(next_time(), 'http_response_times', {upper_90 = 4, foo = 1}, {http_method = 'POST'})
     local state, result = lma_alarm.evaluate(next_time()) -- window 60 second
     assertEquals(state, consts.WARN)
-    assertItemsEquals(result[1].alert.fields, {{name='http_method', value='POST'}})
+    assertItemsEquals(result[1].alert.fields, {http_method='POST'})
     assertEquals(result[1].alert.value, 6)
 end
 
@@ -781,7 +781,7 @@ function TestLMAAlarm:test_complex_field_matching_alarm_trigger()
     local state, result = lma_alarm.evaluate(next_time()) -- window 60 second
     assertEquals(state, consts.WARN)
     assertEquals(result[1].alert.value, 6) -- the max
-    assertItemsEquals(result[1].alert.fields, {{name='http_method', value='POST || GET'}, {name="http_status", value="2xx || ==3xx"}})
+    assertItemsEquals(result[1].alert.fields, {http_method='POST || GET', http_status='2xx || ==3xx'})
 end
 
 function TestLMAAlarm:test_complex_field_matching_alarm_ok()