Bump influxdb to 2.8 (#933)

Closes #863

docs/INSTALL_MANUAL.md

@@ -10,9 +10,9 @@ Scrutiny is made up of three components: an influxdb Database, a collector and a
 
 ## InfluxDB
 
-Please follow the official InfluxDB installation guide. Note, you'll need to install v2.2.0+. 
+Please follow the official InfluxDB installation guide. Note, you'll need to install v2.8.0+. 
 
-https://docs.influxdata.com/influxdb/v2.2/install/
+https://docs.influxdata.com/influxdb/v2/install/
 
 ## Webapp/API
 

docs/INSTALL_ROOTLESS_PODMAN.md

@@ -88,7 +88,7 @@ Description=influxdb
 
 [Container]
 ContainerName=influxdb
-Image=docker.io/library/influxdb:2.2
+Image=docker.io/library/influxdb:2.8
 AutoUpdate=registry
 Timezone=local
 ## not strictly necessary, but keeps file permission sane for influxdb

docs/TROUBLESHOOTING_INFLUXDB.md

@@ -41,14 +41,14 @@ The growth rate is pretty unintuitive -- see https://github.com/AnalogJ/scrutiny
 
 InfluxDB is a required dependency for Scrutiny v0.4.0+.
 
-https://docs.influxdata.com/influxdb/v2.2/install/
+https://docs.influxdata.com/influxdb/v2/install/
 
 ## Persistence
 
 To ensure that all data is correctly stored, you must also persist the InfluxDB database directory
 
 - If you're using the Official Scrutiny Omnibus image (`ghcr.io/analogj/scrutiny:master-omnibus`), the path is `/opt/scrutiny/influxdb`
-- If you're deploying in Hub/Spoke mode with the InfluxDB maintained image (`influxdb:2.2`), the path is `/var/lib/influxdb2`
+- If you're deploying in Hub/Spoke mode with the InfluxDB maintained image (`influxdb:2.8`), the path is `/var/lib/influxdb2`
 
 If you attempt to restart Scrutiny but you forgot to persist the InfluxDB directory, you will get an error message like follows: