feat(onprem): Add Valkey in-memory node

Add a Valkey node class to diagrams.onprem.inmemory alongside the
  existing Redis class, including its icon resource. Update the node
  reference and example/guide docs to use Valkey, and regenerate all
  affected example diagram images.

  - Add Valkey class and valkey.png resource
  - Document Valkey in docs/nodes/onprem.md
  - Switch advanced web service examples from Redis to Valkey
  - Regenerate all example images in docs/getting-started/examples.md
    and the Edges guide diagrams

Signed-off-by: Roberto Luna-Rojas <roberto.luna.rojas@gmail.com>

diagrams/onprem/inmemory.py

@@ -24,4 +24,8 @@ class Redis(_Inmemory):
     _icon = "redis.png"
 
 
+class Valkey(_Inmemory):
+    _icon = "valkey.png"
+
+
 # Aliases

docs/getting-started/examples.md

@@ -177,7 +177,7 @@ from diagrams import Cluster, Diagram
 from diagrams.onprem.analytics import Spark
 from diagrams.onprem.compute import Server
 from diagrams.onprem.database import PostgreSQL
-from diagrams.onprem.inmemory import Redis
+from diagrams.onprem.inmemory import Valkey
 from diagrams.onprem.aggregator import Fluentd
 from diagrams.onprem.monitoring import Grafana, Prometheus
 from diagrams.onprem.network import Nginx
@@ -196,8 +196,8 @@ with Diagram("Advanced Web Service with On-Premises", show=False):
             Server("grpc3")]
 
     with Cluster("Sessions HA"):
-        primary = Redis("session")
+        primary = Valkey("session")
-        primary - Redis("replica") << metrics
+        primary - Valkey("replica") << metrics
         grpcsvc >> primary
 
     with Cluster("Database HA"):
@@ -220,7 +220,7 @@ from diagrams import Cluster, Diagram, Edge
 from diagrams.onprem.analytics import Spark
 from diagrams.onprem.compute import Server
 from diagrams.onprem.database import PostgreSQL
-from diagrams.onprem.inmemory import Redis
+from diagrams.onprem.inmemory import Valkey
 from diagrams.onprem.aggregator import Fluentd
 from diagrams.onprem.monitoring import Grafana, Prometheus
 from diagrams.onprem.network import Nginx
@@ -239,8 +239,8 @@ with Diagram(name="Advanced Web Service with On-Premises (colored)", show=False)
             Server("grpc3")]
 
     with Cluster("Sessions HA"):
-        primary = Redis("session")
+        primary = Valkey("session")
-        primary - Edge(color="brown", style="dashed") - Redis("replica") << Edge(label="collect") << metrics
+        primary - Edge(color="brown", style="dashed") - Valkey("replica") << Edge(label="collect") << metrics
         grpcsvc >> Edge(color="brown") >> primary
 
     with Cluster("Database HA"):

docs/guides/edge.md

@@ -16,7 +16,7 @@ from diagrams import Cluster, Diagram, Edge
 from diagrams.onprem.analytics import Spark
 from diagrams.onprem.compute import Server
 from diagrams.onprem.database import PostgreSQL
-from diagrams.onprem.inmemory import Redis
+from diagrams.onprem.inmemory import Valkey
 from diagrams.onprem.aggregator import Fluentd
 from diagrams.onprem.monitoring import Grafana, Prometheus
 from diagrams.onprem.network import Nginx
@@ -35,10 +35,10 @@ with Diagram(name="Advanced Web Service with On-Premises (colored)", show=False)
             Server("grpc3")]
 
     with Cluster("Sessions HA"):
-        primary = Redis("session")
+        primary = Valkey("session")
         primary \
             - Edge(color="brown", style="dashed") \
-            - Redis("replica") \
+            - Valkey("replica") \
             << Edge(label="collect") \
             << metrics
         grpcsvc >> Edge(color="brown") >> primary
@@ -80,7 +80,7 @@ from diagrams import Cluster, Diagram, Node
 from diagrams.onprem.analytics import Spark
 from diagrams.onprem.compute import Server
 from diagrams.onprem.database import PostgreSQL
-from diagrams.onprem.inmemory import Redis
+from diagrams.onprem.inmemory import Valkey
 from diagrams.onprem.aggregator import Fluentd
 from diagrams.onprem.monitoring import Grafana, Prometheus
 from diagrams.onprem.network import Nginx
@@ -109,8 +109,8 @@ with Diagram("\nAdvanced Web Service with On-Premise Less edges", show=False) as
             blankHA >> db
 
         with Cluster("Sessions HA"):
-            sess = Redis("session")
+            sess = Valkey("session")
-            sess - Redis("replica") << metrics
+            sess - Valkey("replica") << metrics
             blankHA >> sess
 
     ingress >> serv2 >> blankHA
@@ -143,7 +143,7 @@ from diagrams import Cluster, Diagram, Edge, Node
 from diagrams.onprem.analytics import Spark
 from diagrams.onprem.compute import Server
 from diagrams.onprem.database import PostgreSQL
-from diagrams.onprem.inmemory import Redis
+from diagrams.onprem.inmemory import Valkey
 from diagrams.onprem.aggregator import Fluentd
 from diagrams.onprem.monitoring import Grafana, Prometheus
 from diagrams.onprem.network import Nginx
@@ -176,8 +176,8 @@ with Diagram("\n\nAdvanced Web Service with On-Premise Merged edges", show=False
     blank = Node("", shape="plaintext", height="0.0", width="0.0")
 
     with Cluster("Sessions HA"):
-        sess = Redis("session")
+        sess = Valkey("session")
-        sess - Redis("replica") << metrics
+        sess - Valkey("replica") << metrics
 
     with Cluster("Database HA"):
         db = PostgreSQL("users")

docs/nodes/onprem.md

@@ -317,6 +317,9 @@ Node classes list of the onprem provider.
 <img width="30" src="/img/resources/onprem/inmemory/redis.png" alt="Redis" style="float: left; padding-right: 5px;" >
 **diagrams.onprem.inmemory.Redis**
 
+<img width="30" src="/img/resources/onprem/inmemory/valkey.png" alt="Valkey" style="float: left; padding-right: 5px;" >
+**diagrams.onprem.inmemory.Valkey**
+
 ## onprem.logging