Add dot to some DNS address to reduce lookups (#5789)

Kubernetes sets up a DNS search path like `namespace.svc.cluster.local,
svc.cluster.local, cluster.local, google.internal`; any unqualified name
is first tried as a prefix to each of these. These requests, which will
never succeed, add latency and increase load on the DNS service.

Adding a `.` at the end makes the name fully-qualified, so Go's DNS
client will skip the search path and use the name as-is.

Note only changes a subset of addresses in the config; others didn't
seem to be causing a problem.

CHANGELOG.md

@@ -129,6 +129,60 @@ to include only the most relevant.
 * [4938](https://github.com/grafana/loki/pull/4938) **DylanGuedes**: Add distributor ring page
 * [4879](https://github.com/grafana/loki/pull/4879) **cyriltovena**: LogQL: add __line__ function to | line_format template
 * [4858](https://github.com/grafana/loki/pull/4858) **sandy2008**: feat(): add ManagedIdentity in Azure Blob Storage
+## Main
+* [5789](https://github.com/grafana/loki/pull/5789) **bboreham**: Production config: add dot to some DNS address to reduce lookups.
+* [5780](https://github.com/grafana/loki/pull/5780) **simonswine**: Update alpine image to 3.15.4.
+* [5715](https://github.com/grafana/loki/pull/5715) **chaudum** Add option to push RFC5424 syslog messages from Promtail in syslog scrape target.
+* [5696](https://github.com/grafana/loki/pull/5696) **paullryan** don't block scraping of new logs from cloudflare within promtail if an error is received from cloudflare about too early logs.
+* [5685](https://github.com/grafana/loki/pull/5625) **chaudum** Fix bug in push request parser that allowed users to send arbitrary non-string data as "log line".
+* [5707](https://github.com/grafana/loki/pull/5707) **franzwong** Promtail: Rename config name limit_config to limits_config.
+* [5626](https://github.com/grafana/loki/pull/5626) **jeschkies** Support multi-tenant select logs and samples queries.
+* [5622](https://github.com/grafana/loki/pull/5622) **chaudum**: Fix bug in query splitter that caused `interval` query parameter to be ignored and therefore returning more logs than expected.
+* [5521](https://github.com/grafana/loki/pull/5521) **cstyan**: Move stream lag configuration to top level clients config struct and refactor stream lag metric, this resolves a bug with duplicate metric collection when a single Promtail binary is running multiple Promtail clients.
+* [5568](https://github.com/grafana/loki/pull/5568) **afayngelerindbx**: Fix canary panics due to concurrent execution of `confirmMissing`
+* [5552](https://github.com/grafana/loki/pull/5552) **jiachengxu**: Loki mixin: add `DiskSpaceUtilizationPanel`
+* [5541](https://github.com/grafana/loki/pull/5541) **bboreham**: Queries: reject very deeply nested regexps which could crash Loki.
+* [5536](https://github.com/grafana/loki/pull/5536) **jiachengxu**: Loki mixin: make labelsSelector in loki chunks dashboards configurable
+* [5535](https://github.com/grafana/loki/pull/5535) **jiachengxu**: Loki mixins: use labels selector for loki chunks dashboard
+* [5507](https://github.com/grafana/loki/pull/5507) **MichelHollands**: Remove extra param in call for inflightRequests metric.
+* [5481](https://github.com/grafana/loki/pull/5481) **MichelHollands**: Add a DeletionMode config variable to specify the delete mode and validate match parameters.
+* [5356](https://github.com/grafana/loki/pull/5356) **jbschami**: Enhance lambda-promtail to support adding extra labels from an environment variable value
+* [5409](https://github.com/grafana/loki/pull/5409) **ldb**: Enable best effort parsing for Syslog messages
+* [5392](https://github.com/grafana/loki/pull/5392) **MichelHollands**: Etcd credentials are parsed as secrets instead of plain text now.
+* [5361](https://github.com/grafana/loki/pull/5361) **ctovena**: Add usage report to grafana.com.
+* [5289](https://github.com/grafana/loki/pull/5289) **ctovena**: Fix deduplication bug in queries when mutating labels.
+* [5302](https://github.com/grafana/loki/pull/5302) **MasslessParticle** Update azure blobstore client to use new sdk.
+* [5243](https://github.com/grafana/loki/pull/5290) **ssncferreira**: Update Promtail to support duration string formats.
+* [5266](https://github.com/grafana/loki/pull/5266) **jeschkies**: Write Promtail position file atomically on Unix.
+* [5280](https://github.com/grafana/loki/pull/5280) **jeschkies**: Fix Docker target connection loss.
+* [5243](https://github.com/grafana/loki/pull/5243) **owen-d**: moves `querier.split-queries-by-interval` to limits code only.
+* [5139](https://github.com/grafana/loki/pull/5139) **DylanGuedes**: Drop support for legacy configuration rules format.
+* [5262](https://github.com/grafana/loki/pull/5262) **MichelHollands**: Remove the labelFilter field
+* [4911](https://github.com/grafana/loki/pull/4911) **jeschkies**: Support Docker service discovery in Promtail.
+* [5107](https://github.com/grafana/loki/pull/5107) **chaudum** Fix bug in fluentd plugin that caused log lines containing non UTF-8 characters to be dropped.
+* [5148](https://github.com/grafana/loki/pull/5148) **chaudum** Add periodic task to prune old expired items from the FIFO cache to free up memory.
+* [5187](https://github.com/grafana/loki/pull/5187) **aknuds1** Rename metric `cortex_experimental_features_in_use_total` to `loki_experimental_features_in_use_total` and metric `log_messages_total` to `loki_log_messages_total`.
+* [5170](https://github.com/grafana/loki/pull/5170) **chaudum** Fix deadlock in Promtail caused when targets got removed from a target group by the discovery manager.
+* [5163](https://github.com/grafana/loki/pull/5163) **chaudum** Fix regression in fluentd plugin introduced with #5107 that caused `NoMethodError` when parsing non-string values of log lines.
+* [5144](https://github.com/grafana/loki/pull/5144) **dannykopping** Ruler: fix remote write basic auth credentials.
+* [5091](https://github.com/grafana/loki/pull/5091) **owen-d**: Changes `ingester.concurrent-flushes` default to 32
+* [5031](https://github.com/grafana/loki/pull/5031) **liguozhong**: Promtail: Add global read rate limiting.
+* [4879](https://github.com/grafana/loki/pull/4879) **cyriltovena**: LogQL: add __line__ function to | line_format template.
+* [5081](https://github.com/grafana/loki/pull/5081) **SasSwart**: Add the option to configure memory ballast for Loki
+* [5085](https://github.com/grafana/loki/pull/5085) **aknuds1**: Upgrade Cortex to [e0807c4eb487](https://github.com/cortexproject/cortex/compare/4e9fc3a2b5ab..e0807c4eb487) and Prometheus to [692a54649ed7](https://github.com/prometheus/prometheus/compare/2a3d62ac8456..692a54649ed7)
+* [5067](https://github.com/grafana/loki/pull/5057) **cstyan**: Add a metric to Azure Blob Storage client to track total egress bytes
+* [5065](https://github.com/grafana/loki/pull/5065) **AndreZiviani**: lambda-promtail: Add ability to ingest logs from S3
+* [4950](https://github.com/grafana/loki/pull/4950) **DylanGuedes**: Implement common instance addr/net interface
+* [4949](https://github.com/grafana/loki/pull/4949) **ssncferreira**: Add query `queueTime` metric to statistics and metrics.go
+* [4938](https://github.com/grafana/loki/pull/4938) **DylanGuedes**: Implement ring status page for the distributor
+* [5023](https://github.com/grafana/loki/pull/5023) **ssncferreira**: Move `querier.split-queries-by-interval` to a per-tenant configuration
+* [4993](https://github.com/grafana/loki/pull/4926) **thejosephstevens**: Fix parent of wal and wal_cleaner in loki ruler config docs
+* [4933](https://github.com/grafana/loki/pull/4933) **jeschkies**: Support matchers in series label values query.
+* [4926](https://github.com/grafana/loki/pull/4926) **thejosephstevens**: Fix comment in Loki module loading for accuracy
+* [4920](https://github.com/grafana/loki/pull/4920) **chaudum**: Add `-list-targets` command line flag to list all available run targets
+* [4860](https://github.com/grafana/loki/pull/4860) **cyriltovena**: Add rate limiting and metrics to hedging
+* [4865](https://github.com/grafana/loki/pull/4865) **taisho6339**: Fix duplicate registry.MustRegister call in Promtail Kafka
+* [4845](https://github.com/grafana/loki/pull/4845) **chaudum** Return error responses consistently as JSON
 * [4826](https://github.com/grafana/loki/pull/4826) **cyriltovena**: Adds the ability to hedge storage requests.
 * [4785](https://github.com/grafana/loki/pull/4785) **DylanGuedes**: Loki: Print current config by calling /config
 * [4775](https://github.com/grafana/loki/pull/4775) **jeschkies**: Make `*` and `+` non-greedy to double regex filter speed.

production/ksonnet/loki/query-scheduler.libsonnet

@@ -7,10 +7,10 @@ local k = import 'ksonnet-util/kausal.libsonnet';
   _config+:: {
     loki+: if $._config.query_scheduler_enabled then {
       frontend+: {
-        scheduler_address: 'query-scheduler-discovery.%s.svc.cluster.local:9095' % $._config.namespace,
+        scheduler_address: 'query-scheduler-discovery.%s.svc.cluster.local.:9095' % $._config.namespace,
       },
       frontend_worker+: {
-        scheduler_address: 'query-scheduler-discovery.%s.svc.cluster.local:9095' % $._config.namespace,
+        scheduler_address: 'query-scheduler-discovery.%s.svc.cluster.local.:9095' % $._config.namespace,
       },
       query_scheduler+: {
         max_outstanding_requests_per_tenant: max_outstanding,
@@ -20,7 +20,7 @@ local k = import 'ksonnet-util/kausal.libsonnet';
         max_outstanding_per_tenant: max_outstanding,
       },
       frontend_worker+: {
-        frontend_address: 'query-frontend.%s.svc.cluster.local:9095' % $._config.namespace,
+        frontend_address: 'query-frontend.%s.svc.cluster.local.:9095' % $._config.namespace,
       },
     },
   },