Add cron schedules and sync docs

agent/go.mod

@@ -6,6 +6,8 @@ require (
 	github.com/BurntSushi/toml v1.6.0
 	github.com/google/uuid v1.6.0
 	github.com/prometheus/client_golang v1.23.2
+	github.com/prometheus/client_model v0.6.2
+	github.com/robfig/cron/v3 v3.0.1
 )
 
 require (
@@ -13,7 +15,6 @@ require (
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
-	github.com/prometheus/client_model v0.6.2 // indirect
 	github.com/prometheus/common v0.66.1 // indirect
 	github.com/prometheus/procfs v0.16.1 // indirect
 	go.yaml.in/yaml/v2 v2.4.2 // indirect