Regression: host metrics are not available running only source plugins #2821
Description
Describe the bug
After this change, falcosecurity/libs#1362 host metrics will no longer be available when running a source plugin like k8saduit. This is a regression and we need to find a way to address it.
Metrics extracted with dummy plugin in Falco 0.36.0-rc3
{
"output_fields": {
"evt.source": "dummy",
"evt.time": 1695381599561603364,
"falco.container_memory_used": 0,
"falco.cpu_usage_perc": 0.0,
"falco.duration_sec": 1695381599,
"falco.host_boot_ts": 0,
"falco.host_num_cpus": 0,
"falco.hostname": "",
"falco.kernel_release": "",
"falco.memory_pss": 25,
"falco.memory_rss": 29,
"falco.memory_vsz": 1779,
"falco.num_evts": 18641280,
"falco.num_evts_prev": 0,
"falco.outputs_queue_num_drops": 0,
"falco.start_ts": 0,
"falco.version": "0.36.0-rc3",
"scap.engine_name": "source_plugin"
},
"sample": 1
}
{
"output_fields": {
"evt.source": "dummy",
"evt.time": 1695381604561553388,
"falco.container_memory_used": 0,
"falco.cpu_usage_perc": 0.1,
"falco.duration_sec": 1695381604,
"falco.evts_rate_sec": 3573155.7144059963,
"falco.host_boot_ts": 0,
"falco.host_num_cpus": 0,
"falco.hostname": "",
"falco.kernel_release": "",
"falco.memory_pss": 25,
"falco.memory_rss": 29,
"falco.memory_vsz": 1908,
"falco.num_evts": 36506880,
"falco.num_evts_prev": 18641280,
"falco.outputs_queue_num_drops": 0,
"falco.start_ts": 0,
"falco.version": "0.36.0-rc3",
"scap.engine_name": "source_plugin"
},
"sample": 2
}