Update version of loki referenced in docker files to 2.9.0 (#10564)

This PR updates the version of Loki used by our sample Dockerfiles to
the most recent version of 2.9.0.

docs/sources/setup/install/docker.md

@@ -25,10 +25,10 @@ The configuration acquired with these installation instructions run Loki as a si
 Copy and paste the commands below into your command line.
 
 ```bash
-wget https://raw.githubusercontent.com/grafana/loki/v2.8.3/cmd/loki/loki-local-config.yaml -O loki-config.yaml
-docker run --name loki -d -v $(pwd):/mnt/config -p 3100:3100 grafana/loki:2.8.3 -config.file=/mnt/config/loki-config.yaml
-wget https://raw.githubusercontent.com/grafana/loki/v2.8.3/clients/cmd/promtail/promtail-docker-config.yaml -O promtail-config.yaml
-docker run --name promtail -d -v $(pwd):/mnt/config -v /var/log:/var/log --link loki grafana/promtail:2.8.3 -config.file=/mnt/config/promtail-config.yaml
+wget https://raw.githubusercontent.com/grafana/loki/v2.9.0/cmd/loki/loki-local-config.yaml -O loki-config.yaml
+docker run --name loki -d -v $(pwd):/mnt/config -p 3100:3100 grafana/loki:2.9.0 -config.file=/mnt/config/loki-config.yaml
+wget https://raw.githubusercontent.com/grafana/loki/v2.9.0/clients/cmd/promtail/promtail-docker-config.yaml -O promtail-config.yaml
+docker run --name promtail -d -v $(pwd):/mnt/config -v /var/log:/var/log --link loki grafana/promtail:2.9.0 -config.file=/mnt/config/promtail-config.yaml
 ```
 
 When finished, `loki-config.yaml` and `promtail-config.yaml` are downloaded in the directory you chose. Docker containers are running Loki and Promtail using those config files.
@@ -43,10 +43,10 @@ Copy and paste the commands below into your terminal. Note that you will need to
 
 ```bash
 cd "<local-path>"
-wget https://raw.githubusercontent.com/grafana/loki/v2.8.3/cmd/loki/loki-local-config.yaml -O loki-config.yaml
-docker run --name loki -v <local-path>:/mnt/config -p 3100:3100 grafana/loki:2.8.3 --config.file=/mnt/config/loki-config.yaml
-wget https://raw.githubusercontent.com/grafana/loki/v2.8.3/clients/cmd/promtail/promtail-docker-config.yaml -O promtail-config.yaml
-docker run -v <local-path>:/mnt/config -v /var/log:/var/log --link loki grafana/promtail:2.8.3 --config.file=/mnt/config/promtail-config.yaml
+wget https://raw.githubusercontent.com/grafana/loki/v2.9.0/cmd/loki/loki-local-config.yaml -O loki-config.yaml
+docker run --name loki -v <local-path>:/mnt/config -p 3100:3100 grafana/loki:2.9.0 --config.file=/mnt/config/loki-config.yaml
+wget https://raw.githubusercontent.com/grafana/loki/v2.9.0/clients/cmd/promtail/promtail-docker-config.yaml -O promtail-config.yaml
+docker run -v <local-path>:/mnt/config -v /var/log:/var/log --link loki grafana/promtail:2.9.0 --config.file=/mnt/config/promtail-config.yaml
 ```
 
 When finished, `loki-config.yaml` and `promtail-config.yaml` are downloaded in the directory you chose. Docker containers are running Loki and Promtail using those config files.
@@ -58,6 +58,6 @@ Navigate to http://localhost:3100/metrics to view the output.
 Run the following commands in your command line. They work for Windows or Linux systems.
 
 ```bash
-wget https://raw.githubusercontent.com/grafana/loki/v2.8.3/production/docker-compose.yaml -O docker-compose.yaml
+wget https://raw.githubusercontent.com/grafana/loki/v2.9.0/production/docker-compose.yaml -O docker-compose.yaml
 docker-compose -f docker-compose.yaml up
 ```

examples/getting-started/docker-compose.yaml

@@ -6,7 +6,7 @@ networks:
 
 services:
   read:
-    image: grafana/loki:2.8.3
+    image: grafana/loki:2.9.0
     command: "-config.file=/etc/loki/config.yaml -target=read"
     ports:
       - 3101:3100
@@ -27,7 +27,7 @@ services:
           - loki
 
   write:
-    image: grafana/loki:2.8.3
+    image: grafana/loki:2.9.0
     command: "-config.file=/etc/loki/config.yaml -target=write"
     ports:
       - 3102:3100
@@ -46,7 +46,7 @@ services:
       <<: *loki-dns
 
   promtail:
-    image: grafana/promtail:2.8.3
+    image: grafana/promtail:2.9.0
     volumes:
       - ./promtail-local-config.yaml:/etc/promtail/config.yaml:ro
       - /var/run/docker.sock:/var/run/docker.sock

production/docker-compose.yaml

@@ -5,7 +5,7 @@ networks:
 
 services:
   loki:
-    image: grafana/loki:2.8.3
+    image: grafana/loki:2.9.0
     ports:
       - "3100:3100"
     command: -config.file=/etc/loki/local-config.yaml
@@ -13,7 +13,7 @@ services:
       - loki
 
   promtail:
-    image: grafana/promtail:2.8.3
+    image: grafana/promtail:2.9.0
     volumes:
       - /var/log:/var/log
     command: -config.file=/etc/promtail/config.yml

production/docker/docker-compose.yaml

@@ -14,7 +14,7 @@ services:
   # Loki would not have permissions to create the directories.
   # Therefore the init container changes permissions of the mounted directory.
   init:
-    image: &lokiImage grafana/loki:2.8.3
+    image: &lokiImage grafana/loki:2.9.0
     user: root
     entrypoint:
       - "chown"
@@ -71,7 +71,7 @@ services:
       - ./loki/:/var/log/
 
   promtail:
-    image: grafana/promtail:2.8.3
+    image: grafana/promtail:2.9.0
     volumes:
       - ./loki/:/var/log/
       - ./config:/etc/promtail/