Improve server file names to reflect official docs (#19472)

Signed-off-by: Naseem <naseemkullah@gmail.com>

stable/prometheus/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: prometheus
-version: 9.5.1
+version: 9.5.2
 appVersion: 2.13.1
 description: Prometheus is a monitoring system and time series database.
 home: https://prometheus.io/

stable/prometheus/README.md

@@ -325,8 +325,10 @@ Parameter | Description | Default
 `serviceAccounts.server.name` | name of the server service account to use or create | `{{ prometheus.server.fullname }}`
 `server.terminationGracePeriodSeconds` | Prometheus server Pod termination grace period | `300`
 `server.retention` | (optional) Prometheus data retention | `"15d"`
-`serverFiles.alerts` | Prometheus server alerts configuration | `{}`
-`serverFiles.rules` | Prometheus server rules configuration | `{}`
+`serverFiles.alerts` | (Deprecated) Prometheus server alerts configuration | `{}`
+`serverFiles.rules` | (Deprecated) Prometheus server rules configuration | `{}`
+`serverFiles.alerting_rules.yml` | Prometheus server alerts configuration | `{}`
+`serverFiles.recording_rules.yml` | Prometheus server rules configuration | `{}`
 `serverFiles.prometheus.yml` | Prometheus server scrape configuration | example configuration
 `extraScrapeConfigs` | Prometheus server additional scrape configuration | ""
 `alertRelabelConfigs` | Prometheus server [alert relabeling configs](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#alert_relabel_configs) for H/A prometheus | ""

stable/prometheus/values.yaml

@@ -1062,7 +1062,7 @@ serverFiles:
 
   ## Alerts configuration
   ## Ref: https://prometheus.io/docs/prometheus/latest/configuration/alerting_rules/
-  alerts: {}
+  alerting_rules.yml: {}
   # groups:
   #   - name: Instances
   #     rules:
@@ -1074,11 +1074,20 @@ serverFiles:
   #         annotations:
   #           description: '{{ $labels.instance }} of job {{ $labels.job }} has been down for more than 5 minutes.'
   #           summary: 'Instance {{ $labels.instance }} down'
+  ## DEPRECATED DEFAULT VALUE, unless explicitly naming your files, please use alerting_rules.yml
+  alerts: {}
 
+  ## Records configuration
+  ## Ref: https://prometheus.io/docs/prometheus/latest/configuration/recording_rules/
+  recording_rules.yml: {}
+  ## DEPRECATED DEFAULT VALUE, unless explicitly naming your files, please use recording_rules.yml
   rules: {}
 
   prometheus.yml:
     rule_files:
+      - /etc/config/recording_rules.yml
+      - /etc/config/alerting_rules.yml
+    ## Below two files are DEPRECATED will be removed from this default values file
       - /etc/config/rules
       - /etc/config/alerts