[prometheus-snmp-exporter] bump to 0.28.0 (#5325)

Signed-off-by: Casey Robb <casey.robb@redhat.com>

Author: caseyrobb

charts/prometheus-snmp-exporter/Chart.yaml

@@ -1,8 +1,8 @@
 apiVersion: v1
 description: Prometheus SNMP Exporter
 name: prometheus-snmp-exporter
-version: 6.0.0
-appVersion: v0.27.0
+version: 7.0.0
+appVersion: v0.28.0
 home: https://github.com/prometheus/snmp_exporter
 sources:
   - https://github.com/prometheus/snmp_exporter

charts/prometheus-snmp-exporter/README.md

@@ -98,6 +98,11 @@ This version changes the default image repository from using Dockerhub to Quay.
 
 This version changes the default health check path from `/health` to `/`
 
+### To 7.0.0
+
+This version changes the sysUpTime metric by removing from the if_mib module and including it as part of the new system module, along with other useful system related metrics.
+Update your scrape definitions to include the system module if you need sysUpTime.
+
 ## Configuration
 
 See [Customizing the Chart Before Installing](https://helm.sh/docs/intro/using_helm/#customizing-the-chart-before-installing). To see all configurable options with detailed comments, visit the chart's [values.yaml](./values.yaml), or run these configuration commands: