Add example config for using with vanilla prometheus.

Signed-off-by: Tom Wilkie <[email protected]>

Author: tomwilkie

docs/prometheus-frontend.yml

@@ -0,0 +1,43 @@
+# You can use the Cortex query frontend with any Prometheus-API compatible
+# service, including Prometheus and Thanos.  Use this config file to get
+# the benefits of query parallelisation and caching.
+
+# Disable the requirement that every request to Cortex has a
+# X-Scope-OrgID header. `fake` will be substituted in instead.
+auth_enabled: false
+
+# We only want to run the query-frontend module.
+target: query-frontend
+
+# We don't want the usual /api/prom prefix.
+http_prefix:
+
+server:
+  http_listen_port: 9091
+
+frontend:
+  split_queries_by_day: true
+  align_queries_with_step: true
+  cache_results: true
+  compress_responses: true
+
+  results_cache:
+    max_freshness: 1m
+    cache:
+
+      # We're going to use the in-process "FIFO" cache, but you can enable
+      # memcached below.
+      enable_fifocache: true
+      fifocache:
+        size: 1024
+        validity: 24h
+
+      # If you want to use a memcached cluster, configure a headless service
+      # in Kubernetes and Cortex will discover the individual instances using
+      # a SRV DNS query.  Cortex will then do client-side hashing to spread
+      # the load evenly.
+      # memcached:
+      #   memcached_client:
+      #     host: memcached.default.svc.cluster.local
+      #     service: memcached
+      #     consistent_hash: true