.. Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. .. include:: ../../../../common.defs .. _admin-stats-core-hostdb: HostDB ****** The HostDB component of |TS| manages origin server name resolution and host health checks. The statistics documented here can help to ensure that your |TS| instances are not spending an unreasonable amount of timing resolving your origin servers' hostnames prior to object revalidation or retrieval. .. ts:stat:: global proxy.process.hostdb.bytes integer :type: counter :units: bytes Represents the number of bytes allocated to the HostDB lookup cache. .. ts:stat:: global proxy.process.hostdb.re_dns_on_reload integer :type: counter .. ts:stat:: global proxy.process.hostdb.total_entries integer :type: counter Represents the total number of host entries currently in the HostDB lookup cache. .. ts:stat:: global proxy.process.hostdb.total_hits integer :type: counter Represents the total number of origin server name resolutions which were satisfied by entries in the HostDB lookup cache, since statistics collection began. .. ts:stat:: global proxy.process.hostdb.total_serve_stale integer :type: counter 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 :ts:cv:`proxy.config.hostdb.serve_stale_for` for how this feature is configured. .. ts:stat:: global proxy.process.hostdb.total_lookups integer :type: counter 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. .. ts:stat:: global proxy.process.hostdb.ttl_expires integer :type: gauge :units: seconds .. ts:stat:: global proxy.process.hostdb.ttl float :type: gauge :units: seconds .. ts:stat:: global proxy.process.hostdb.cache.current_items integer :type: gauge The number of distinct host records in the HostDB cache. .. ts:stat:: global proxy.process.hostdb.cache.current_size integer :type: gauge :units: bytes The total size of all host records in the HostDB cache. .. ts:stat:: global proxy.process.hostdb.cache.last_sync.time integer :type: gauge The Unix timestamp of the last successful sync of HostDB's cache to disk .. ts:stat:: global proxy.process.hostdb.cache.last_sync.total_items integer :type: gauge The number of distinct host records in the HostDB cache that where synced to disk. .. ts:stat:: global proxy.process.hostdb.cache.last_sync.total_size integer :type: gauge :units: bytes The total size of all host records in the HostDB cache that where synced to disk. .. ts:stat:: global proxy.process.hostdb.cache.total_failed_inserts integer :type: counter The number of host records that where unable to be inserted into HostDB's cache .. ts:stat:: global proxy.process.hostdb.cache.total_hits integer :type: counter The total number of successful lookups for host records from HostDB's cache .. ts:stat:: global proxy.process.hostdb.cache.total_inserts integer :type: counter The number host records inserted into HostDB's cache .. ts:stat:: global proxy.process.hostdb.cache.total_lookups integer :type: counter The total number of lookups for host records from HostDB's cache