docs: document service ping configuration and data sent (#10167)

# Which Problems Are Solved

With the introduction of the service ping, we'll send data from all
systems back to a central endpoint for analytics and getting insights
about usage. To make it visible what data is sent and provide the users
an easy way to opt-out, we need a small documentation to tell them what
and how.

# How the Problems Are Solved

Document the service ping including what data is sent and how to opt-out
or configure most important settings.

# Additional Changes

None

# Additional Context

relates to #9869

docs/docs/self-hosting/manage/service_ping.md

@@ -0,0 +1,83 @@
+---
+title: Service Ping
+sidebar_label: Service Ping 
+---
+
+Service Ping is a feature that periodically sends anonymized analytics and usage data from your ZITADEL system to a central endpoint.
+This data helps improve ZITADEL by providing insights into its usage patterns.
+
+The feature is enabled by default, but can be disabled either completely or for specific reports.
+Checkout the configuration options below.
+
+## Data Sent by Service Ping
+
+### Base Information
+
+If the feature is enabled, the base information will always be sent. To prevent that, you can opt out by disabling the entire Service Ping:
+
+```yaml
+ServicePing:
+  Enabled: false # ZITADEL_SERVICEPING_ENABLED
+```
+
+The base information sent back includes the following:
+- your systemID
+- the currently run version of ZITADEL
+- information on all instances
+  - id
+  - creation date
+  - domains
+
+### Resource Counts
+
+Resource counts is a report that provides us with information about the number of resources in your ZITADEL instances.
+
+The following resources are counted:
+- Instances
+- Organizations
+- Projects per organization
+- Users per organization
+- Instance Administrators
+- Identity Providers
+- LDAP Identity Providers
+- Actions (V1)
+- Targets and set up executions
+- Login Policies
+- Password Complexity Policies
+- Password Expiry Policies
+- Lockout Policies
+
+The list might be extended in the future to include more resources.
+
+To disable this report, set the following in your configuration file:
+
+```yaml
+ServicePing:
+  Telemetry:
+    ResourceCounts:
+      Enabled: false # ZITADEL_SERVICEPING_TELEMETRY_RESOURCECOUNT_ENABLED
+```
+
+## Configuration
+
+The Service Ping feature can be configured through the runtime configuration. Please check out the configuration file
+for all available options. Below is a list of the most important options:
+
+### Interval
+
+This defines at which interval the Service Ping feature sends data to the central endpoint. It supports the extended cron syntax
+and by default is set to `@daily`, which means it will send data every day. The time is randomized on startup to prevent
+all systems from sending data at the same time.
+
+You can adjust it to your needs to make sure there is no performance impact on your system.
+For example, if you already have some scheduled job syncing data in and out of ZITADEL around a specific time or have regularly a
+lot of traffic during the day, you might want to change it to a different time, e.g. `15 4 * * *` to send it every day at 4:15 AM.
+
+The interval must be at least 30 minutes to prevent too frequent requests to the central endpoint.
+
+### MaxAttempts
+
+This defines how many attempts the Service Ping feature will make to send data to the central endpoint before giving up
+for a specific interval and report. If one report fails, it will be retried up to this number of times. 
+Other reports will still be handled in parallel and have their own retry count. This means if the base information 
+only succeeded after three attempts, the resource count still has five attempts to be sent. 

docs/sidebars.js

@@ -1117,6 +1117,7 @@ module.exports = {
         "self-hosting/manage/tls_modes",
         "self-hosting/manage/database/database",
         "self-hosting/manage/cache",
+        "self-hosting/manage/service_ping",
         "self-hosting/manage/updating_scaling",
         "self-hosting/manage/usage_control",
         {