Add `charts` to templates (#11054)

Add new entities to Netdata templates.

2 files changed, 24 insertions, 0 deletions

diff --git a/health/REFERENCE.md b/health/REFERENCE.md
index 6621c5bd6c..efcd9fe013 100644
--- a/health/REFERENCE.md
+++ b/health/REFERENCE.md
@@ -62,6 +62,7 @@ Netdata parses the following lines. Beneath the table is an in-depth explanation
 | [`hosts`](#alarm-line-hosts)                        | no              | Which hostnames will run this alarm.                                                  |
 | [`plugin`](#alarm-line-plugin)                      | no              | Restrict an alarm or template to only a certain plugin.                                             |
 | [`module`](#alarm-line-module)                      | no              | Restrict an alarm or template to only a certain module.                                             |
+| [`charts`](#alarm-line-charts)                      | no              | Restrict an alarm or template to only certain charts.                                             |
 | [`families`](#alarm-line-families)                  | no              | Restrict a template to only certain families.                                         |
 | [`lookup`](#alarm-line-lookup)                      | yes             | The database lookup to find and process metrics for the chart specified through `on`. |
 | [`calc`](#alarm-line-calc)                          | yes (see above) | A calculation to apply to the value found via `lookup` or another variable.           |
@@ -177,6 +178,19 @@ plugin: python.d.plugin
 module: isc_dhcpd
 ```
 
+#### Alarm line `charts`
+
+The `charts` line filters which chart this alarm should apply to. It is only available on entities using the 
+[`template`](#alarm-line-alarm-or-template) line.
+The value is a space-separated list of [simple patterns](/libnetdata/simple_pattern/README.md). For
+example, a template that applies to `disk.svctm` (Average Service Time) context, but excludes the disk `sdb` from alarms:
+
+```yaml
+template: disk_svctm_alarm
+      on: disk.svctm
+  charts: !*sdb* *
+```
+
 #### Alarm line `families`
 
 The `families` line, used only alongside templates, filters which families within the context this alarm should apply
diff --git a/health/health_config.c b/health/health_config.c
index 6094c91fd1..756023715e 100644
--- a/health/health_config.c
+++ b/health/health_config.c
@@ -12,6 +12,7 @@
 #define HEALTH_FAMILIES_KEY "families"
 #define HEALTH_PLUGIN_KEY "plugin"
 #define HEALTH_MODULE_KEY "module"
+#define HEALTH_CHARTS_KEY "charts"
 #define HEALTH_LOOKUP_KEY "lookup"
 #define HEALTH_CALC_KEY "calc"
 #define HEALTH_EVERY_KEY "every"
@@ -493,6 +494,7 @@ static int health_readfile(const char *filename, void *data) {
             hash_families = 0,
             hash_plugin = 0,
             hash_module = 0,
+            hash_charts = 0,
             hash_calc = 0,
             hash_green = 0,
             hash_red = 0,
@@ -523,6 +525,7 @@ static int health_readfile(const char *filename, void *data) {
         hash_families = simple_uhash(HEALTH_FAMILIES_KEY);
         hash_plugin = simple_uhash(HEALTH_PLUGIN_KEY);
         hash_module = simple_uhash(HEALTH_MODULE_KEY);
+        hash_charts = simple_uhash(HEALTH_CHARTS_KEY);
         hash_calc = simple_uhash(HEALTH_CALC_KEY);
         hash_lookup = simple_uhash(HEALTH_LOOKUP_KEY);
         hash_green = simple_uhash(HEALTH_GREEN_KEY);
@@ -945,6 +948,13 @@ static int health_readfile(const char *filename, void *data) {
                 rt->module_match = strdupz(value);
                 rt->module_pattern = simple_pattern_create(rt->module_match, NULL, SIMPLE_PATTERN_EXACT);
             }
+            else if(hash == hash_charts && !strcasecmp(key, HEALTH_CHARTS_KEY)) {
+                freez(rt->charts_match);
+                simple_pattern_free(rt->charts_pattern);
+
+                rt->charts_match = strdupz(value);
+                rt->charts_pattern = simple_pattern_create(rt->charts_match, NULL, SIMPLE_PATTERN_EXACT);
+            }
             else if(hash == hash_lookup && !strcasecmp(key, HEALTH_LOOKUP_KEY)) {
                 health_parse_db_lookup(line, filename, value, &rt->group, &rt->after, &rt->before,
                         &rt->update_every, &rt->options, &rt->dimensions, &rt->foreachdim);