add `_is_k8s_node` label to the host labels (#10501)

* auto format system-info.sh

* detect whether the node is k8s node in system-info.sh

* fix unmae=>uname

* add_is_k8s_node_to_host_labels: Add new variable to structure

* add_is_k8s_node_to_host_labels: Add is_k8_node to labels

* add_is_k8s_node_to_host_labels: Add is_k8_node inside endpoint

* add_is_k8s_node_to_host_labels: Add data to swagge file

* change yes/no to true/false

* Update web/api/netdata-swagger.json

* add_is_k8s_node_to_host_labels: Add anonymous statistic

* add_is_k8s_node_to_host_labels: Add information to using-host-labels.md

* add_is_k8s_node_to_host_labels: Add variable to stream

* add_is_k8s_node_to_host_labels: Change swagger.yaml

* add_is_k8s_node_to_host_labels: Adding missing documentation

* add_is_k8s_node_to_host_labels: rename variable

* add_is_k8s_node_to_host_labels: Rename lables to match variable names

* add_is_k8s_node_to_host_labels: Add to wget

* add_is_k8s_node_to_host_labels: Add content to swagger files

* add_is_k8s_node_to_host_labels: update both swagger files

* add_is_k8s_node_to_host_labels: fix wrong exportation

Co-authored-by: Thiago Marques <thiagoftsm@gmail.com>

2 files changed, 10 insertions, 0 deletions

diff --git a/database/rrd.h b/database/rrd.h
index 86f4226348..f52d34af8a 100644
--- a/database/rrd.h
+++ b/database/rrd.h
@@ -721,6 +721,7 @@ struct rrdhost_system_info {
     char *virt_detection;
     char *container;
     char *container_detection;
+    char *is_k8s_node;
 };
 
 struct rrdhost {
diff --git a/database/rrdhost.c b/database/rrdhost.c
index e120e9d445..8b8a2dc2a6 100644
--- a/database/rrdhost.c
+++ b/database/rrdhost.c
@@ -758,6 +758,7 @@ void rrdhost_system_info_free(struct rrdhost_system_info *system_info) {
         freez(system_info->virt_detection);
         freez(system_info->container);
         freez(system_info->container_detection);
+        freez(system_info->is_k8s_node);
         freez(system_info);
     }
 }
@@ -982,6 +983,10 @@ static struct label *rrdhost_load_auto_labels(void)
         label_list =
             add_label_to_list(label_list, "_virt_detection", localhost->system_info->virt_detection, LABEL_SOURCE_AUTO);
 
+    if (localhost->system_info->is_k8s_node)
+        label_list =
+            add_label_to_list(label_list, "_is_k8s_node", localhost->system_info->is_k8s_node, LABEL_SOURCE_AUTO);
+
     label_list = add_label_to_list(
         label_list, "_is_parent", (localhost->next || configured_as_parent()) ? "true" : "false", LABEL_SOURCE_AUTO);
 
@@ -1523,6 +1528,10 @@ int rrdhost_set_system_info_variable(struct rrdhost_system_info *system_info, ch
         freez(system_info->container_detection);
         system_info->container_detection = strdupz(value);
     }
+    else if(!strcmp(name, "NETDATA_HOST_IS_K8S_NODE")){
+        freez(system_info->is_k8s_node);
+        system_info->is_k8s_node = strdupz(value);
+    }
     else if (!strcmp(name, "NETDATA_SYSTEM_CPU_VENDOR"))
         return res;
     else if (!strcmp(name, "NETDATA_SYSTEM_CPU_MODEL"))