HostDB

The HostDB component of Traffic Server manages origin server name resolution and host health checks. The statistics documented here can help to ensure that your Traffic Server instances are not spending an unreasonable amount of timing resolving your origin servers’ hostnames prior to object revalidation or retrieval.

proxy.process.hostdb.bytes
Collection:global
Type:counter
Datatype:integer

Represents the number of bytes allocated to the HostDB lookup cache.

proxy.process.hostdb.re_dns_on_reload
Collection:global
Type:counter
Datatype:integer
proxy.process.hostdb.total_entries
Collection:global
Type:counter
Datatype:integer

Represents the total number of host entries currently in the HostDB lookup cache.

proxy.process.hostdb.total_hits
Collection:global
Type:counter
Datatype:integer

Represents the total number of origin server name resolutions which were satisfied by entries in the HostDB lookup cache, since statistics collection began.

proxy.process.hostdb.total_lookups
Collection:global
Type:counter
Datatype:integer

Represents the total number of origin server name resolutions which have been performed, since statistics collection began, regardless of whether they were satisfied by the HostDB lookup cache or required DNS lookups.

proxy.process.hostdb.ttl_expires
Collection:global
Type:gauge
Datatype:integer
proxy.process.hostdb.ttl
Collection:global
Type:gauge
Datatype:float
proxy.process.hostdb.cache.current_items
Collection:global
Type:gauge
Datatype:integer

The number of distinct host records in the HostDB cache.

proxy.process.hostdb.cache.current_size
Collection:global
Type:gauge
Datatype:integer

The total size of all host records in the HostDB cache.

proxy.process.hostdb.cache.last_sync.time
Collection:global
Type:gauge
Datatype:integer

The Unix timestamp of the last successful sync of HostDB’s cache to disk

proxy.process.hostdb.cache.last_sync.total_items
Collection:global
Type:gauge
Datatype:integer

The number of distinct host records in the HostDB cache that where synced to disk.

proxy.process.hostdb.cache.last_sync.total_size
Collection:global
Type:gauge
Datatype:integer

The total size of all host records in the HostDB cache that where synced to disk.

proxy.process.hostdb.cache.total_failed_inserts
Collection:global
Type:counter
Datatype:integer

The number of host records that where unable to be inserted into HostDB’s cache

proxy.process.hostdb.cache.total_hits
Collection:global
Type:counter
Datatype:integer

The total number of successful lookups for host records from HostDB’s cache

proxy.process.hostdb.cache.total_inserts
Collection:global
Type:counter
Datatype:integer

The number host records inserted into HostDB’s cache

proxy.process.hostdb.cache.total_lookups
Collection:global
Type:counter
Datatype:integer

The total number of lookups for host records from HostDB’s cache