Configuration -> Hosts. To determine active check availability heartbeat messages are now sent in the active check thread. The frequency of the heartbeat messages is set by the new HeartbeatFrequency parameter seconds by default, 0-3600 range). Active checks are considered unavailable when the active check heartbeat is older than 2 x HeartbeatFrequency seconds. Attention: This functionality will only work if data sender - proxy data sender • discoverer - process for discovery of devices • heartbeat sender - proxy heartbeat sender • history syncer - history DB writer • housekeeper - process for removal of

to be recreated manually. Heartbeat dropped from Zabbix proxy The heartbeat sender has been removed from the proxy. Therefore, Zabbix proxy item zabbix [process,heartbeat sender] is no longer supported update for all hosts. Heartbeat support is deprecated Starting from Zabbix 6.4 heartbeat sender is removed from the proxy, and therefore, Zabbix proxy item zabbix [process,heartbeat sender] is not supported HeartbeatFrequency parameter has been deprecated. Autoregistration heartbeat for Zabbix server The active agent autoregistration heartbeat for Zabbix server has been set to 120 seconds (the same as for Zabbix

regular expression (validation) • Check for error in JSON (validation) • Discard unchanged with heartbeat (throttling) • Prometheus to JSON For more details, see: Preprocessing in low-level discovery data sender - proxy data sender • discoverer - process for discovery of devices • heartbeat sender - proxy heartbeat sender • history syncer - history DB writer • housekeeper - process for removal of for that hour. Only one throttling option can be specified for an item. Discard unchanged with heartbeat Discard a value if it has not changed within the defined time period (in seconds). Positive integer

Discard unchanged Discard a value if it has not changed. Throttling Discard unchanged with heartbeat Discard a value if it has not changed within the defined time period. Prometheus pattern Use the previous value to calculate the change from; • for Discard unchanged, Discard unchanged with heartbeat steps - the next value will never be discarded, even if it should have been because of discarding that hour.
• Only one throttling option can be specified per item. Discard unchanged with heartbeat Discard a value if it has not changed within the defined time period (in seconds). Comments:

data sender - proxy data sender • discoverer - process for discovery of devices • heartbeat sender - proxy heartbeat sender • history syncer - history DB writer • housekeeper - process for removal of for that hour. Only one throttling option can be specified for an item. Discard unchanged with heartbeat Discard a value if it has not changed within the defined time period (in seconds). Positive integer no previous value to calculated change from; • for Discard unchanged. Discard unchanged with heartbeat steps - the next value will never be discarded, even if it should have been because of discarding

data sender - proxy data sender • discoverer - process for discovery of devices • heartbeat sender - proxy heartbeat sender • history syncer - history DB writer • housekeeper - process for removal of option can be specified for an item. 156 Type Transformation Description Discard unchanged with heartbeat Discard a value if it has not changed within the defined time period (in seconds). Positive integer no previous value to calculated change from; • for Discard unchanged. Discard unchanged with heartbeat steps - the next value will never be discarded, even if it should have been because of discarding

data sender - proxy data sender • discoverer - process for discovery of devices • heartbeat sender - proxy heartbeat sender • history poller - process for handling calculated, aggregated and internal value if the Zabbix server database has not been upgraded. 174 Type Discard unchanged with heartbeat Discard a value if it has not changed within the defined time period (in seconds). Positive no previous value to calculated change from; • for Discard unchanged. Discard unchanged with heartbeat steps - the next value will never be discarded, even if it should have been because of discarding

data sender - proxy data sender • discoverer - process for discovery of devices • heartbeat sender - proxy heartbeat sender • history syncer - history DB writer • housekeeper - process for removal of server database has not been upgraded. 205 Type Transformation Description Discard unchanged with heartbeat Discard a value if it has not changed within the defined time period (in seconds). Positive integer no previous value to calculated change from; • for Discard unchanged. Discard unchanged with heartbeat steps - the next value will never be discarded, even if it should have been because of discarding

data sender - proxy data sender • discoverer - process for discovery of devices • heartbeat sender - proxy heartbeat sender • history poller - process for handling calculated, aggregated and internal history as the same value, unless Zabbix server database is upgraded. Discard unchanged with heartbeat Discard a value if it has not changed within the defined time period (in seconds). Positive integer no previous value to calculated change from; • for Discard unchanged. Discard unchanged with heartbeat steps - the next value will never be discarded, even if it should have been because of discarding

monitored by a proxy that appears to be offline (no updates received from the proxy during the maximum heartbeat interval - 1 hour), • host is disabled. 5.20.12 Support for multiple escalators Zabbix now supports connections between Zabbix server and Zabbix proxy. 91 The following messages were removed: sending heartbeat message to server failed: Error while sending data to the server [] Error while receiving history data to server: sending history data to server: error:"", info:"" heartbeat from active proxy on "" failed: misconfiguration error: the proxy is running in the