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
- Units:
- bytes
- 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_serve_stale
- 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 while those entries were
stale, since statistics collection began. See
proxy.config.hostdb.serve_stale_for for how this feature is
configured.
- 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
- Units:
- seconds
- Datatype:
- integer
- proxy.process.hostdb.ttl
- Collection:
- global
- Type:
- gauge
- Units:
- seconds
- 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
- Units:
- bytes
- 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
- Units:
- bytes
- 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