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>

3 files changed, 13 insertions, 2 deletions

diff --git a/web/api/netdata-swagger.json b/web/api/netdata-swagger.json
index 47f5fe379d..ed2555f830 100644
--- a/web/api/netdata-swagger.json
+++ b/web/api/netdata-swagger.json
@@ -9,7 +9,7 @@
     "/info": {
       "get": {
         "summary": "Get netdata basic information",
-        "description": "The info endpoint returns basic information about netdata. It provides:\n* netdata version\n* netdata unique id\n* list of hosts mirrored (includes itself)\n* Operating System, Virtualization and Container technology information\n* List of active collector plugins and modules\n* number of alarms in the host\n  * number of alarms in normal state\n  * number of alarms in warning state\n  * number of alarms in critical state\n",
+        "description": "The info endpoint returns basic information about netdata. It provides:\n* netdata version\n* netdata unique id\n* list of hosts mirrored (includes itself)\n* Operating System, Virtualization, K8s nodes and Container technology information\n* List of active collector plugins and modules\n* number of alarms in the host\n  * number of alarms in normal state\n  * number of alarms in warning state\n  * number of alarms in critical state\n",
         "responses": {
           "200": {
             "description": "netdata basic information.",
@@ -1172,6 +1172,11 @@
             "description": "Kernel Version.",
             "example": "4.19.32-1-MANJARO"
           },
+          "is_k8s_node": {
+            "type": "boolean",
+            "description": "Netdata is running on a K8s node.",
+            "example": false
+          },
           "architecture": {
             "type": "string",
             "description": "Kernel architecture.",
diff --git a/web/api/netdata-swagger.yaml b/web/api/netdata-swagger.yaml
index 8ccf299812..748274216f 100644
--- a/web/api/netdata-swagger.yaml
+++ b/web/api/netdata-swagger.yaml
@@ -12,7 +12,7 @@ paths:
         * netdata version
         * netdata unique id
         * list of hosts mirrored (includes itself)
-        * Operating System, Virtualization and Container technology information
+        * Operating System, Virtualization, K8s nodes and Container technology information
         * List of active collector plugins and modules
         * number of alarms in the host
           * number of alarms in normal state
@@ -948,6 +948,10 @@ components:
           type: string
           description: Kernel Version.
           example: 4.19.32-1-MANJARO
+        is_k8s_node:
+          type: boolean
+          description: Netdata is running on a K8s node.
+          example: false
         architecture:
           type: string
           description: Kernel architecture.
diff --git a/web/api/web_api_v1.c b/web/api/web_api_v1.c
index 4287675418..73ac15d30d 100644
--- a/web/api/web_api_v1.c
+++ b/web/api/web_api_v1.c
@@ -933,6 +933,8 @@ inline int web_client_api_request_v1_info_fill_buffer(RRDHOST *host, BUFFER *wb)
         buffer_sprintf(wb, "\t\"container_os_version_id\": \"%s\",\n", host->system_info->container_os_version_id);
     if (host->system_info->container_os_detection)
         buffer_sprintf(wb, "\t\"container_os_detection\": \"%s\",\n", host->system_info->container_os_detection);
+    if (host->system_info->is_k8s_node)
+        buffer_sprintf(wb, "\t\"is_k8s_node\": \"%s\",\n", host->system_info->is_k8s_node);
 
     buffer_sprintf(wb, "\t\"kernel_name\": \"%s\",\n", (host->system_info->kernel_name) ? host->system_info->kernel_name : "");
     buffer_sprintf(wb, "\t\"kernel_version\": \"%s\",\n", (host->system_info->kernel_version) ? host->system_info->kernel_version : "");