add details of all pre-installed dashboards (#1127)

Author: lake-of-dreams

docs-source/site/docs/observability/dashboards.md

@@ -8,13 +8,31 @@ More details can be found in the [SigNoz Documentation](https://signoz.io/docs/i
 
 ## Pre-installed dashboards
 
-The following dashboards are pre-installed in SigNoz:
-
-- [Spring Boot Observability](#spring-boot-observability)
-- [Spring Boot Statistics](#spring-boot-statistics)
-- [Oracle Database Dashboard](#oracle-database-dashboard)
-- [Kube State Metrics Dashboard](#kube-state-metrics-dashboard)
-- [Apache APISIX Dashboard](#apache-apisix-dashboard)
+There are several dashboards that are pre-installed in SigNoz, For example:
+
+- [Pre-installed dashboards](#pre-installed-dashboards)
+  - [Spring Boot Observability](#spring-boot-observability)
+  - [Spring Boot Statistics](#spring-boot-statistics)
+  - [Oracle Database Dashboard](#oracle-database-dashboard)
+  - [Kube State Metrics Dashboard](#kube-state-metrics-dashboard)
+  - [Apache APISIX Dashboard](#apache-apisix-dashboard)
+  - [Helidon Main Dashboard](#helidon-main-dashboard)
+  - [Helidon MP Details](#helidon-mp-details)
+  - [Helidon SE Details](#helidon-se-details)
+  - [Helidon JVM Details](#helidon-jvm-details)
+  - [APM Metrics](#apm-metrics)
+  - [Kafka Server Monitoring Dashboard](#kafka-server-monitoring-dashboard)
+  - [Kubernetes Pod Metrics - Overall](#kubernetes-pod-metrics---overall)
+  - [Kubernetes Pod Metrics - Detailed](#kubernetes-pod-metrics---detailed)
+  - [Kubernetes PVC Metrics](#kubernetes-pvc-metrics)
+  - [Kubernetes Node Metrics - Overall](#kubernetes-node-metrics---overall)
+  - [Kubernetes Node Metrics - Detailed](#kubernetes-node-metrics---detailed)
+  - [DB Calls Monitoring](#db-calls-monitoring)
+  - [Host Metrics (k8s)](#host-metrics-k8s)
+  - [HTTP API Monitoring](#http-api-monitoring)
+  - [JVM Metrics](#jvm-metrics)
+  - [NGINX (OTEL)](#nginx-otel)
+  - [MicroTx](#microtx)
 
 ### Spring Boot Observability
 
@@ -91,3 +109,91 @@ This dashboard provides details of the APISIX API Gateway including:
 Here is an example of this dashboard:
 
 ![Apache APISIX Dashboard](images/apache-apisix-dashboard.png)
+
+In addition, following dashboards are also pre-installed:
+
+ ### Helidon Main Dashboard
+Combined dashboard for Heap memory usage statistics about all [Helidon SE](https://helidon.io/docs/v3/about/introduction) and [Helidon MP](https://helidon.io/docs/v4/mp/introduction) applications deployed in cluster.
+
+![Helidon Main Dashboard](images/helidon-main-dashboard.png)
+
+ ### Helidon MP Details
+Details about CPU and Memory usage of [Helidon MP](https://helidon.io/docs/v4/mp/introduction) applications along with statistics about HTTP/REST requests per JVM.
+
+![Helidon MP Dashboard](images/helidon-mp-dashboard.png)
+
+ ### Helidon SE Details
+Details about Memory usage of [Helidon SE](https://helidon.io/docs/v3/about/introduction) applications along with statistics about HTTP/REST requests per JVM.
+
+![Helidon SE Dashboard](images/helidon-se-dashboard.png)
+
+ ### Helidon JVM Details
+JVM level details about Helidon applications, including statistics about [Virtual Threads](https://docs.oracle.com/en/java/javase/24/core/virtual-threads.html), CPU and Memory usage and HTTP requests
+
+![Helidon JVM Dashboard](images/helidon-jvm-dashboard.png)
+
+ ### APM Metrics
+Application Performance overview for all deployed services in terms of request execution times and consistency.
+
+![APM Dashboard](images/apm-dashboard.png)
+
+ ### Kafka Server Monitoring Dashboard
+Details about Kafka brokers, partitions, consumers, topics and partitions etc.
+
+![Kafka Dashboard](images/kafka-dashboard.png)
+
+ ### Kubernetes Pod Metrics - Overall
+Aggregated view of CPU, Memory, FileSystem, and Network usage by pods.
+
+![Kubernetes Pod Metrics Overall](images/k8s-pod-metrics-overall.png)
+
+ ### Kubernetes Pod Metrics - Detailed
+Detailed view of CPU, Memory, FileSystem, and Network usage by pods.
+
+![Kubernetes Pod Metrics Detailed](images/k8s-pod-metrics-detailed.png)
+
+ ### Kubernetes PVC Metrics
+Capacity and Usage statistics about Persistent Volume Claims in the cluster.
+
+![Kubernetes PVC Metrics](images/k8s-pvc-metrics.png)
+
+ ### Kubernetes Node Metrics - Overall
+Aggregated view of CPU, Memory, FileSystem, and Network usage by Nodes in the cluster.
+
+![Kubernetes Node Metrics Overall Dashboard](images/k8s-node-metrics-overall.png)
+
+ ### Kubernetes Node Metrics - Detailed
+Detailed view of CPU, Memory, FileSystem, and Network usage by Nodes in the cluster.
+
+![Kubernetes Node Metrics Detailed Dashboard](images/k8s-node-metrics-detailed.png)
+
+ ### DB Calls Monitoring
+Details about [DB attributes from opentelemetry](https://opentelemetry.io/docs/specs/semconv/attributes-registry/db/).
+
+![Host Metrics Dashboard](images/db-calls-dashboard.png)
+
+ ### Host Metrics (k8s)
+This dashboard uses the system metrics collected from the [hostmetrics receiver](https://uptrace.dev/opentelemetry/collector/host-metrics) to show CPU, Memory, Disk, Network and Filesystem usage
+
+![Host Metrics Dashboard](images/host-metrics-dashboard.png)
+
+ ### HTTP API Monitoring
+This dashboard is built on top of available [HTTP attributes from opentelemetry](https://opentelemetry.io/docs/specs/semconv/attributes-registry/http/) and provides insights about endpoint level performance indicators for HTTP calls.
+
+![HTTP API Dashboard](images/http-api-dashboard.png)
+
+ ### JVM Metrics
+JVM Runtime metrics for all services deployed in cluster in terms of CPU/Memory usage, Garbage collection events, threads and class loading/unloading.
+
+![JVM Metrics Dashboard](images/jvm-metrics-dashboard.png)
+
+ ### NGINX (OTEL)
+Details about connections/requests being handled by the the [NGINX Ingress controller](https://github.com/kubernetes/ingress-nginx).
+
+![Nginx Dashboard](images/nginx-dashboard.png)
+
+ ### MicroTx
+Details about Transaction Manager for Microservices(https://docs.oracle.com/en/database/oracle/transaction-manager-for-microservices/24.2/tmmdg/oracle-transaction-manager-microservices.html) component and statistics about participating transactions.
+
+![MicroTx Dashboard](images/microtx-dashboard.png)
+