new(metrics): enable plugins metrics

Signed-off-by: Gianmatteo Palmieri <mail@gian.im>
Co-authored-by: Melissa Kilby <melissa.kilby.oss@gmail.com>

falco.yaml

@@ -1037,6 +1037,11 @@ syscall_event_drops:
 # beneficial for exploring the data schema and ensuring that fields with empty
 # values are included in the output.
 #
+# `plugins_metrics_enabled`: Falco can now expose your custom plugins' 
+# metrics. Please note that if the respective plugin has no metrics implemented, 
+# there will be no metrics available. In other words, there are no default or 
+# generic plugin metrics at this time. This may be subject to change.
+#
 # If metrics are enabled, the web server can be configured to activate the
 # corresponding Prometheus endpoint using `webserver.prometheus_metrics_enabled`.
 # Prometheus output can be used in combination with the other output options.
@@ -1055,6 +1060,7 @@ metrics:
   state_counters_enabled: true
   kernel_event_counters_enabled: true
   libbpf_stats_enabled: true
+  plugins_metrics_enabled: true
   convert_memory_to_mb: true
   include_empty_values: false
 

userspace/falco/configuration.cpp

@@ -72,7 +72,7 @@ falco_configuration::falco_configuration():
 	m_metrics_interval(5000),
 	m_metrics_stats_rule_enabled(false),
 	m_metrics_output_file(""),
-	m_metrics_flags((METRICS_V2_KERNEL_COUNTERS | METRICS_V2_LIBBPF_STATS | METRICS_V2_RESOURCE_UTILIZATION | METRICS_V2_STATE_COUNTERS | METRICS_V2_RULE_COUNTERS)),
+	m_metrics_flags(0),
 	m_metrics_convert_memory_to_mb(true),
 	m_metrics_include_empty_values(false)
 {
@@ -555,6 +555,10 @@ void falco_configuration::load_yaml(const std::string& config_name)
 	{
 		m_metrics_flags |= METRICS_V2_LIBBPF_STATS;
 	}
+	if (config.get_scalar<bool>("metrics.plugins_metrics_enabled", true))
+	{
+		m_metrics_flags |= METRICS_V2_PLUGINS;
+	}
 
 	m_metrics_convert_memory_to_mb = config.get_scalar<bool>("metrics.convert_memory_to_mb", true);
 	m_metrics_include_empty_values = config.get_scalar<bool>("metrics.include_empty_values", false);

userspace/falco/falco_metrics.cpp

@@ -222,10 +222,17 @@ std::string falco_metrics::to_text(const falco::app::state& state)
 		{
 			prometheus_metrics_converter.convert_metric_to_unit_convention(metric);
 			std::string namespace_name = "scap";
+			
 			if (metric.flags & METRICS_V2_RESOURCE_UTILIZATION || metric.flags & METRICS_V2_KERNEL_COUNTERS)
 			{
 				namespace_name = "falco";
 			}
+
+			if (metric.flags & METRICS_V2_PLUGINS)
+			{
+				namespace_name = "plugins";
+			}
+
 			prometheus_text += prometheus_metrics_converter.convert_metric_to_text_prometheus(metric, "falcosecurity", namespace_name);
 		}
 

userspace/falco/stats_writer.cpp

@@ -440,6 +440,10 @@ void stats_writer::collector::get_metrics_output_fields_additional(
 			{
 				strlcpy(metric_name, "scap.", sizeof(metric_name));
 			}
+			if(metric.flags & METRICS_V2_PLUGINS)
+			{
+				strlcpy(metric_name, "plugins.", sizeof(metric_name));
+			}
 			strlcat(metric_name, metric.name, sizeof(metric_name));
 
 			switch (metric.type)
@@ -451,6 +455,13 @@ void stats_writer::collector::get_metrics_output_fields_additional(
 				}
 				output_fields[metric_name] = metric.value.u32;
 				break;
+			case METRIC_VALUE_TYPE_S32:
+				if (metric.value.s32 == 0 && !m_writer->m_config->m_metrics_include_empty_values)
+				{
+					break;
+				}
+				output_fields[metric_name] = metric.value.s32;
+				break;
 			case METRIC_VALUE_TYPE_U64:
 				if (strncmp(metric.name, "n_evts", 7) == 0)
 				{
@@ -492,6 +503,13 @@ void stats_writer::collector::get_metrics_output_fields_additional(
 				}
 				output_fields[metric_name] = metric.value.u64;
 				break;
+			case METRIC_VALUE_TYPE_S64:
+				if (metric.value.s64 == 0 && !m_writer->m_config->m_metrics_include_empty_values)
+				{
+					break;
+				}
+				output_fields[metric_name] = metric.value.s64;
+				break;
 			case METRIC_VALUE_TYPE_D:
 				if (metric.value.d == 0 && !m_writer->m_config->m_metrics_include_empty_values)
 				{
@@ -499,6 +517,20 @@ void stats_writer::collector::get_metrics_output_fields_additional(
 				}
 				output_fields[metric_name] = metric.value.d;
 				break;
+			case METRIC_VALUE_TYPE_F:
+				if (metric.value.f == 0 && !m_writer->m_config->m_metrics_include_empty_values)
+				{
+					break;
+				}
+				output_fields[metric_name] = metric.value.f;
+				break;
+			case METRIC_VALUE_TYPE_I:
+				if (metric.value.i == 0 && !m_writer->m_config->m_metrics_include_empty_values)
+				{
+					break;
+				}
+				output_fields[metric_name] = metric.value.i;
+				break;
 			default:
 				break;
 			}