chore: follow-up to grafana#11151 and grafana#11025 (grafana#11225)

**What this PR does / why we need it**:

- remove usage of `enforce_metric_name` in ksonnet -
grafana#11151
- make `cortex_ruler_client_request_duration_seconds` prefix
configurable
- updates upgrade guide to remove reference to metrics that loki does
not export

**Which issue(s) this PR fixes**:
Fixes #<issue number>

**Special notes for your reviewer**:

**Checklist**
- [x] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)
- [ ] Documentation added
- [ ] Tests updated
- [ ] `CHANGELOG.md` updated
- [ ] If the change is worth mentioning in the release notes, add
`add-to-release-notes` label
- [ ] Changes that require user attention or interaction to upgrade are
documented in `docs/sources/setup/upgrade/_index.md`
- [ ] For Helm chart changes bump the Helm chart version in
`production/helm/loki/Chart.yaml` and update
`production/helm/loki/CHANGELOG.md` and
`production/helm/loki/README.md`. [Example
PR](grafana@d10549e)
- [ ] If the change is deprecating or removing a configuration option,
update the `deprecated-config.yaml` and `deleted-config.yaml` files
respectively in the `tools/deprecated-config-checker` directory.
[Example
PR](grafana@0d4416a)

docs/sources/setup/install/helm/reference.md

@@ -2027,7 +2027,6 @@ null
 			<td>Limits config</td>
 			<td><pre lang="json">
 {
-  "enforce_metric_name": false,
   "max_cache_freshness_per_query": "10m",
   "reject_old_samples": true,
   "reject_old_samples_max_age": "168h",

docs/sources/setup/upgrade/_index.md

@@ -241,10 +241,6 @@ Some Loki metrics started with the prefix `cortex_`. In this release they will b
  - `cortex_query_scheduler_queue_duration_seconds_sum`
  - `cortex_query_scheduler_queue_length`
  - `cortex_query_scheduler_running`
- - `cortex_quota_cgroup_cpu_max`
- - `cortex_quota_cgroup_cpu_period`
- - `cortex_quota_cpu_count`
- - `cortex_quota_gomaxprocs`
  - `cortex_ring_member_heartbeats_total`
  - `cortex_ring_member_tokens_owned`
  - `cortex_ring_member_tokens_to_own`

pkg/ruler/base/client_pool.go

@@ -48,27 +48,29 @@ func newRulerClientPool(clientCfg grpcclient.Config, logger log.Logger, reg prom
 	})
 
 	return &rulerClientsPool{
-		client.NewPool("ruler", poolCfg, nil, newRulerClientFactory(clientCfg, reg), clientsCount, logger),
+		client.NewPool("ruler", poolCfg, nil, newRulerClientFactory(clientCfg, reg, metricsNamespace), clientsCount, logger),
 	}
 }
 
-func newRulerClientFactory(clientCfg grpcclient.Config, reg prometheus.Registerer) client.PoolFactory {
+func newRulerClientFactory(clientCfg grpcclient.Config, reg prometheus.Registerer, metricsNamespace string) client.PoolFactory {
 	requestDuration := promauto.With(reg).NewHistogramVec(prometheus.HistogramOpts{
-		Name:    "cortex_ruler_client_request_duration_seconds",
-		Help:    "Time spent executing requests to the ruler.",
-		Buckets: prometheus.ExponentialBuckets(0.008, 4, 7),
+		Namespace: metricsNamespace,
+		Name:      "ruler_client_request_duration_seconds",
+		Help:      "Time spent executing requests to the ruler.",
+		Buckets:   prometheus.ExponentialBuckets(0.008, 4, 7),
 	}, []string{"operation", "status_code"})
 
 	return client.PoolAddrFunc(func(addr string) (client.PoolClient, error) {
 		return dialRulerClient(clientCfg, addr, requestDuration)
 	})
 }
 
-func newRulerPoolClient(clientCfg grpcclient.Config, reg prometheus.Registerer) func(addr string) (client.PoolClient, error) {
+func newRulerPoolClient(clientCfg grpcclient.Config, reg prometheus.Registerer, metricsNamespace string) func(addr string) (client.PoolClient, error) {
 	requestDuration := promauto.With(reg).NewHistogramVec(prometheus.HistogramOpts{
-		Name:    "cortex_ruler_client_request_duration_seconds",
-		Help:    "Time spent executing requests to the ruler.",
-		Buckets: prometheus.ExponentialBuckets(0.008, 4, 7),
+		Namespace: metricsNamespace,
+		Name:      "ruler_client_request_duration_seconds",
+		Help:      "Time spent executing requests to the ruler.",
+		Buckets:   prometheus.ExponentialBuckets(0.008, 4, 7),
 	}, []string{"operation", "status_code"})
 
 	return func(addr string) (client.PoolClient, error) {

pkg/ruler/base/client_pool_test.go

@@ -13,6 +13,8 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"google.golang.org/grpc"
+
+	"github.com/grafana/loki/pkg/util/constants"
 )
 
 func Test_newRulerClientFactory(t *testing.T) {
@@ -36,7 +38,7 @@ func Test_newRulerClientFactory(t *testing.T) {
 	flagext.DefaultValues(&cfg)
 
 	reg := prometheus.NewPedanticRegistry()
-	factory := newRulerPoolClient(cfg, reg)
+	factory := newRulerPoolClient(cfg, reg, constants.Loki)
 
 	for i := 0; i < 2; i++ {
 		client, err := factory(listener.Addr().String())
@@ -54,7 +56,7 @@ func Test_newRulerClientFactory(t *testing.T) {
 	require.NoError(t, err)
 
 	assert.Len(t, metrics, 1)
-	assert.Equal(t, "cortex_ruler_client_request_duration_seconds", metrics[0].GetName())
+	assert.Equal(t, "loki_ruler_client_request_duration_seconds", metrics[0].GetName())
 	assert.Equal(t, dto.MetricType_HISTOGRAM, metrics[0].GetType())
 	assert.Len(t, metrics[0].GetMetric(), 1)
 	assert.Equal(t, uint64(2), metrics[0].GetMetric()[0].GetHistogram().GetSampleCount())

production/docker/config/loki.yaml

@@ -89,7 +89,6 @@ schema_config:
 
 limits_config:
   max_cache_freshness_per_query: '10m'
-  enforce_metric_name: false
   reject_old_samples: true
   reject_old_samples_max_age: 30m
   ingestion_rate_mb: 10

production/helm/loki/values.yaml

@@ -254,7 +254,6 @@ loki:
     grpc_listen_port: 9095
   # -- Limits config
   limits_config:
-    enforce_metric_name: false
     reject_old_samples: true
     reject_old_samples_max_age: 168h
     max_cache_freshness_per_query: 10m

production/ksonnet/loki-simple-scalable/example/main.jsonnet

@@ -38,7 +38,6 @@ loki {
         },
       },
       limits_config: {
-        enforce_metric_name: false,
         reject_old_samples_max_age: '168h',  //1 week
         max_global_streams_per_user: 60000,
         ingestion_rate_mb: 75,

production/ksonnet/loki/config.libsonnet

@@ -208,7 +208,6 @@
         query_ingesters_within: '2h',  // twice the max-chunk age (1h default) for safety buffer
       },
       limits_config: {
-        enforce_metric_name: false,
         // align middleware parallelism with shard factor to optimize one-legged sharded queries.
         max_query_parallelism: if $._config.queryFrontend.sharded_queries_enabled then
           // For a sharding factor of 16 (default), this is 256, or enough for 16 sharded queries.

production/nomad/loki-distributed/config.yml

@@ -122,6 +122,5 @@ ruler:
     dir: {{ env "NOMAD_ALLOC_DIR" }}/data/ruler
 
 limits_config:
-  enforce_metric_name: false
   reject_old_samples: true
   reject_old_samples_max_age: 168h

production/nomad/loki-simple/config.yml

@@ -50,7 +50,6 @@ storage_config:
     s3forcepathstyle: true
 
 limits_config:
-  enforce_metric_name: false
   reject_old_samples: true
   reject_old_samples_max_age: 168h
 

production/nomad/loki/config.yml

@@ -50,7 +50,6 @@ storage_config:
     s3forcepathstyle: true
 
 limits_config:
-  enforce_metric_name: false
   reject_old_samples: true
   reject_old_samples_max_age: 168h