telemetry: report anonymous cluster stats by default (#10488)

The reports are what tell us which versions and cluster sizes are
actually in use, and almost nobody flips the flag on, so the numbers we
have are close to useless. Default it on for master, server and mini,
and say in the flag help and the startup log how to turn it off.

Nothing new is collected: still an in-memory cluster id that changes on
restart, version, os, server counts, volume count and disk bytes, sent
once a day by the leader master only.

telemetry/README.md

@@ -8,7 +8,7 @@ A privacy-respecting telemetry system for SeaweedFS that collects cluster-level
 - **Prometheus Integration**: Native Prometheus metrics for monitoring and alerting
 - **Grafana Dashboards**: Pre-built dashboards for data visualization
 - **Protocol Buffers**: Efficient binary data transmission for optimal performance
-- **Opt-in Only**: Disabled by default, requires explicit configuration
+- **Opt-out**: On by default, turned off with a single flag
 - **Docker Compose**: Complete monitoring stack deployment
 - **Automatic Cleanup**: Configurable data retention policies
 
@@ -51,7 +51,7 @@ message TelemetryData {
 - **No Personal Data**: No hostnames, IP addresses, or user information
 - **In-Memory IDs**: Cluster IDs are generated in-memory and change on restart
 - **Aggregated Data**: Only cluster-level statistics, no individual file/user data
-- **Opt-in Only**: Telemetry is disabled by default
+- **Opt-out Anytime**: `-telemetry=false` on the master stops all reporting
 - **Transparent**: Open source implementation, clear data collection policy
 
 ## Collected Data
@@ -86,14 +86,15 @@ go run . -port=8080 -dashboard=true
 ### 2. Configure SeaweedFS
 
 ```bash
-# Enable telemetry in SeaweedFS master (uses default telemetry.seaweedfs.com)
-weed master -telemetry=true
+# Reporting to telemetry.seaweedfs.com is on by default
+weed master
 
-# Or in server mode
-weed server -telemetry=true
+# Send to your own telemetry server instead
+weed master -telemetry.url=http://localhost:8080/api/collect
 
-# Or specify custom telemetry server
-weed master -telemetry=true -telemetry.url=http://localhost:8080/api/collect
+# Turn reporting off
+weed master -telemetry=false
+weed server -master.telemetry=false
 ```
 
 ### 3. Access Dashboards
@@ -107,13 +108,15 @@ weed master -telemetry=true -telemetry.url=http://localhost:8080/api/collect
 ### SeaweedFS Master/Server
 
 ```bash
-# Enable telemetry
--telemetry=true
+# Disable telemetry (enabled by default)
+-telemetry=false
 
 # Set custom telemetry server URL (optional, defaults to telemetry.seaweedfs.com)
 -telemetry.url=http://your-telemetry-server:8080/api/collect
 ```
 
+In `weed server` and `weed mini` the flags are prefixed: `-master.telemetry=false` and `-master.telemetry.url=...`.
+
 ### Telemetry Server
 
 ```bash

weed/command/master.go

@@ -106,7 +106,7 @@ func init() {
 	m.raftHashicorp = cmdMaster.Flag.Bool("raftHashicorp", false, "use hashicorp raft")
 	m.raftBootstrap = cmdMaster.Flag.Bool("raftBootstrap", false, "Whether to bootstrap the Raft cluster")
 	m.telemetryUrl = cmdMaster.Flag.String("telemetry.url", "https://telemetry.seaweedfs.com/api/collect", "telemetry server URL to send usage statistics")
-	m.telemetryEnabled = cmdMaster.Flag.Bool("telemetry", false, "enable telemetry reporting")
+	m.telemetryEnabled = cmdMaster.Flag.Bool("telemetry", true, "report anonymous cluster statistics to telemetry.url, use -telemetry=false to opt out")
 	m.debug = cmdMaster.Flag.Bool("debug", false, "serves runtime profiling data via pprof on the port specified by -debug.port")
 	m.debugPort = cmdMaster.Flag.Int("debug.port", 6060, "http port for debugging")
 }

weed/command/mini.go

@@ -433,7 +433,7 @@ func initMiniMasterFlags() {
 	miniMasterOptions.raftHashicorp = cmdMini.Flag.Bool("master.raftHashicorp", false, "use hashicorp raft")
 	miniMasterOptions.raftBootstrap = cmdMini.Flag.Bool("master.raftBootstrap", false, "whether to bootstrap the Raft cluster")
 	miniMasterOptions.telemetryUrl = cmdMini.Flag.String("master.telemetry.url", "https://telemetry.seaweedfs.com/api/collect", "telemetry server URL")
-	miniMasterOptions.telemetryEnabled = cmdMini.Flag.Bool("master.telemetry", false, "enable telemetry reporting")
+	miniMasterOptions.telemetryEnabled = cmdMini.Flag.Bool("master.telemetry", true, "report anonymous cluster statistics to master.telemetry.url, use -master.telemetry=false to opt out")
 }
 
 // initMiniFilerFlags initializes Filer server flag options

weed/command/server.go

@@ -108,7 +108,7 @@ func init() {
 	masterOptions.heartbeatInterval = cmdServer.Flag.Duration("master.heartbeatInterval", 300*time.Millisecond, "heartbeat interval of master servers, and will be randomly multiplied by [1, 1.25)")
 	masterOptions.electionTimeout = cmdServer.Flag.Duration("master.electionTimeout", 10*time.Second, "election timeout of master servers")
 	masterOptions.telemetryUrl = cmdServer.Flag.String("master.telemetry.url", "https://telemetry.seaweedfs.com/api/collect", "telemetry server URL to send usage statistics")
-	masterOptions.telemetryEnabled = cmdServer.Flag.Bool("master.telemetry", false, "enable telemetry reporting")
+	masterOptions.telemetryEnabled = cmdServer.Flag.Bool("master.telemetry", true, "report anonymous cluster statistics to master.telemetry.url, use -master.telemetry=false to opt out")
 
 	filerOptions.filerGroup = cmdServer.Flag.String("filer.filerGroup", "", "share metadata with other filers in the same filerGroup")
 	filerOptions.collection = cmdServer.Flag.String("filer.collection", "", "all data will be stored in this collection")

weed/telemetry/collector.go

@@ -79,7 +79,7 @@ func (c *Collector) StartPeriodicCollection(interval time.Duration) {
 		return
 	}
 
-	glog.V(0).Infof("Starting telemetry collection every %v", interval)
+	glog.V(0).Infof("Reporting anonymous cluster statistics to %s every %v, use -telemetry=false to opt out", c.client.url, interval)
 
 	// Send initial telemetry after a short delay
 	go func() {