Alertmanager: Strict initialization

cmd/mimir/config-descriptor.json

@@ -16075,13 +16075,24 @@
           "kind": "field",
           "name": "grafana_alertmanager_conditionally_skip_tenant_suffix",
           "required": false,
-          "desc": "Skip starting the Alertmanager for tenants matching this suffix unless they have a promoted, non-default Grafana Alertmanager configuration.",
+          "desc": "Skip starting the Alertmanager for tenants matching this suffix unless they have a promoted, non-default Grafana Alertmanager configuration or they are receiving requests.",
           "fieldValue": null,
           "fieldDefaultValue": "",
           "fieldFlag": "alertmanager.grafana-alertmanager-conditionally-skip-tenant-suffix",
           "fieldType": "string",
           "fieldCategory": "experimental"
         },
+        {
+          "kind": "field",
+          "name": "grafana_alertmanager_idle_grace_period",
+          "required": false,
+          "desc": "Duration to wait before shutting down an idle Alertmanager for a tenant that matches grafana-alertmanager-conditionally-skip-tenant-suffix and is using an unpromoted or default configuration.",
+          "fieldValue": null,
+          "fieldDefaultValue": 300000000000,
+          "fieldFlag": "alertmanager.grafana-alertmanager-grace-period",
+          "fieldType": "duration",
+          "fieldCategory": "experimental"
+        },
         {
           "kind": "field",
           "name": "max_concurrent_get_requests_per_tenant",
@@ -16388,6 +16399,17 @@
           "fieldType": "boolean",
           "fieldCategory": "advanced"
         },
+        {
+          "kind": "field",
+          "name": "strict_initialization",
+          "required": false,
+          "desc": "Skip initializing Alertmanagers for tenants without a non-default, non-empty configuration. For Grafana Alertmanager tenants, configurations not marked as 'promoted' will also be skipped.",
+          "fieldValue": null,
+          "fieldDefaultValue": false,
+          "fieldFlag": "alertmanager.strict-initialization-enabled",
+          "fieldType": "boolean",
+          "fieldCategory": "experimental"
+        },
         {
           "kind": "field",
           "name": "utf8_strict_mode",

cmd/mimir/help-all.txt.tmpl

@@ -240,7 +240,9 @@ Usage of ./cmd/mimir/mimir:
   -alertmanager.grafana-alertmanager-compatibility-enabled
     	[experimental] Enable routes to support the migration and operation of the Grafana Alertmanager.
   -alertmanager.grafana-alertmanager-conditionally-skip-tenant-suffix string
-    	[experimental] Skip starting the Alertmanager for tenants matching this suffix unless they have a promoted, non-default Grafana Alertmanager configuration.
+    	[experimental] Skip starting the Alertmanager for tenants matching this suffix unless they have a promoted, non-default Grafana Alertmanager configuration or they are receiving requests.
+  -alertmanager.grafana-alertmanager-grace-period duration
+    	[experimental] Duration to wait before shutting down an idle Alertmanager for a tenant that matches grafana-alertmanager-conditionally-skip-tenant-suffix and is using an unpromoted or default configuration. (default 5m0s)
   -alertmanager.log-parsing-label-matchers
     	[experimental] Enable logging when parsing label matchers. This flag is intended to be used with -alertmanager.utf8-strict-mode-enabled to validate UTF-8 strict mode is working as intended.
   -alertmanager.max-alerts-count int
@@ -363,6 +365,8 @@ Usage of ./cmd/mimir/mimir:
     	Directory to store Alertmanager state and temporarily configuration files. The content of this directory is not required to be persisted between restarts unless Alertmanager replication has been disabled. (default "./data-alertmanager/")
   -alertmanager.storage.retention duration
     	How long should we store stateful data (notification logs and silences). For notification log entries, refers to how long should we keep entries before they expire and are deleted. For silences, refers to how long should tenants view silences after they expire and are deleted. (default 120h0m0s)
+  -alertmanager.strict-initialization-enabled
+    	[experimental] Skip initializing Alertmanagers for tenants without a non-default, non-empty configuration. For Grafana Alertmanager tenants, configurations not marked as 'promoted' will also be skipped.
   -alertmanager.utf8-migration-logging-enabled
     	[experimental] Enable logging of tenant configurations that are incompatible with UTF-8 strict mode.
   -alertmanager.utf8-strict-mode-enabled

docs/sources/mimir/configure/configuration-parameters/index.md

@@ -2520,10 +2520,17 @@ sharding_ring:
 [grafana_alertmanager_compatibility_enabled: <boolean> | default = false]
 
 # (experimental) Skip starting the Alertmanager for tenants matching this suffix
-# unless they have a promoted, non-default Grafana Alertmanager configuration.
+# unless they have a promoted, non-default Grafana Alertmanager configuration or
+# they are receiving requests.
 # CLI flag: -alertmanager.grafana-alertmanager-conditionally-skip-tenant-suffix
 [grafana_alertmanager_conditionally_skip_tenant_suffix: <string> | default = ""]
 
+# (experimental) Duration to wait before shutting down an idle Alertmanager for
+# a tenant that matches grafana-alertmanager-conditionally-skip-tenant-suffix
+# and is using an unpromoted or default configuration.
+# CLI flag: -alertmanager.grafana-alertmanager-grace-period
+[grafana_alertmanager_idle_grace_period: <duration> | default = 5m]
+
 # (advanced) Maximum number of concurrent GET requests allowed per tenant. The
 # zero value (and negative values) result in a limit of GOMAXPROCS or 8,
 # whichever is larger. Status code 503 is served for GET requests that would
@@ -2684,6 +2691,12 @@ alertmanager_client:
 # CLI flag: -alertmanager.enable-state-cleanup
 [enable_state_cleanup: <boolean> | default = true]
 
+# (experimental) Skip initializing Alertmanagers for tenants without a
+# non-default, non-empty configuration. For Grafana Alertmanager tenants,
+# configurations not marked as 'promoted' will also be skipped.
+# CLI flag: -alertmanager.strict-initialization-enabled
+[strict_initialization: <boolean> | default = false]
+
 # (experimental) Enable UTF-8 strict mode. Allows UTF-8 characters in the
 # matchers for routes and inhibition rules, in silences, and in the labels for
 # alerts. It is recommended that all tenants run the `migrate-utf8` command in