Add cortex-gw-internal to watched gateway metrics (#328)

* Add cortex-gw-internal to watched gateway metrics

* Update CHANGELOG.md

Co-authored-by: Marco Pracucci <marco@pracucci.com>

Author: Johanna Ratliff

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## master / unreleased
 
+* [ENHANCEMENT] Cortex-mixin: Include `cortex-gw-internal` naming variation in default `gateway` job names. #328 
 * [CHANGE] `namespace` template variable in dashboards now only selects namespaces for selected clusters. #311
 * [CHANGE] Alertmanager: mounted overrides configmap to alertmanager too. #315
 * [CHANGE] Memcached: upgraded memcached from `1.5.17` to `1.6.9`. #316

cortex-mixin/config.libsonnet

@@ -34,7 +34,7 @@
       query_scheduler: 'query-scheduler',  // Not part of single-binary.
       table_manager: '(table-manager|cortex$)',
       store_gateway: '(store-gateway|cortex$)',
-      gateway: '(gateway|cortex-gw)',
+      gateway: '(gateway|cortex-gw|cortex-gw-internal)',
       compactor: 'compactor.*',  // Match also custom compactor deployments.
     },