feat(agent): update default for wp hooks options

By default the agent will only instrument hook callbacks from plugins/themes
and will not instrument hook callbacks from wordpress core.

Author: lavarou

agent/php_nrini.c

@@ -1896,7 +1896,7 @@ static PHP_INI_MH(nr_custom_events_max_samples_stored_mh) {
   return SUCCESS;
 }
 
-#define DEFAULT_WORDPRESS_HOOKS_OPTIONS "all_callbacks"
+#define DEFAULT_WORDPRESS_HOOKS_OPTIONS "plugin_callbacks"
 static PHP_INI_MH(nr_wordpress_hooks_options_mh) {
   nrinistr_t* p;
 

agent/scripts/newrelic.ini.template

@@ -1169,17 +1169,17 @@ newrelic.daemon.logfile = "/var/log/newrelic/newrelic-daemon.log"
 ; Setting: newrelic.framework.wordpress.hooks.options
 ; Type   : string (all_callbacks, plugin_callbacks, threshold)
 ; Scope  : per-directory
-; Default: all_callbacks
+; Default: plugin_callbacks
 ; Info   : Sets the options how WordPress hooks are instrumented.
 ;
 ;          New Relic agent can provide different levels of insights into WordPress hooks.
-;          By default, all hook callbacks functions are instrumented ("all_callbacks").
-;          To reduce agent's overhead it is possible to limit the instrumentation to only
-;          plugin/theme callbacks ("plugin_callbacks"). Third option is to monitor hooks
-;          without instrumenting callbacks ("threshold"). This option does not give insights
-;          about plugins/themes.
+;          By default, only plugin/theme callbacks are instrumented ("plugin_callbacks").
+;          At the cost of increased agent's overhead it is possible to extend the
+;          instrumentation to all hook callbacks functions ("all_callbacks")nly. Third option
+;          is to monitor hooks without instrumenting callbacks ("threshold"). This option
+;          does not give insights about plugins/themes.
 ;
-;newrelic.framework.wordpress.hooks.options = "all_callbacks"
+;newrelic.framework.wordpress.hooks.options = "plugin_callbacks"
 
 ; Setting: newrelic.framework.wordpress.hooks.threshold
 ; Type   : time specification string ("500ms", "1s750ms" etc)