collectd 5.5.3 发布，系统监控和统计工具

collectd 5.5.3 发布了，这将是十二月份 5.7 发布之前 5.5.x的最后一个修正版。

主要更新如下：

• collectd: Write threads are stopped before shutdown callbacks are called. Thanks to Florian Forster. #1110

• collectd: A compile error on AIX has been fixed: MSG_DONTWAIT is not available on AIX. Thanks to Chao Yang.

• libcollectdclient: Lines printed to STDERR are now guarded by the environment variable COLLECTD_TRACE. Thanks to Florian Forster. #105

• collectd.conf(5): Various typos have been fixed. Thanks to Marc Fournier.
  Build system: Detection of the Java environment has been made deterministic to allow for reproducible builds. Thanks to Marc Fournier. #1523 

• APC UPS plugin: Unavailable metrics are now skipped instead of reported as 0 (zero). Thanks to Florian Forster. #2025

• Battery plugin: The minimum value has been removed from the power type to allow

• the plugin to report discharging batteries as negative power. Thanks to Florian Forster.

• DBI, Oracle and PostgreSQL plugins: An error message when the type instance is truncated has been added. Thanks to Florian Forster. #4

• cURL-JSON plugin: A possible segmentation fault when parsing unexpected JSON has been fixed. Thanks to Florian Forster. #1896

• DF plugin: Compilation with xfsprogs ≥ 4.7.0 has been fixed. Thanks to Thomas Deutschmann. #1877

• Modbus plugin: Build issues on FreeBSD have been fixed. Thanks to Florian Forster.

• Network plugin: An error message has been corrected. Thanks to Florian Forster.

• Network plugin: Handling of errors form secure memory initialization has been

• improved: the plugin fails gracefully now instead of calling abort(). Thanks to Sebastian Harl.

• Network plugin: The gcrypt library is only initialized when it is actually required due to the network plugin's configuration. Thanks to Florian Forster. #1902

• Ping plugin: The init callback has been changed to be idempotent, fixing errors being reported on Solaris. Thanks to Florian Forster. #869

• PostgreSQL plugin: The query_plans and query_plans_by_table queries have been improved to return 0 (zero) instead of NULL when not available. Thanks to Bernd Zeimetz. #1905

• PowerDNS plugin: The "recursor command" has been fixed so PowerDNS can correctly parse all requested fields. Thanks to Ruben Kerkhof.

• Python plugin: Handling of data sets with multiple data sources of different type has been fixed. Thanks to Sebastian Harl.

• RRDCacheD plugin: Reconnection behavior after failed operations has been added. Thanks to Sebastian Harl. Debian#657877

• Write Graphite and AMQP plugins: A bug that could lead to a missing null-termination has been fixed. Thanks to Markus Linnala.

• Write Kafka plugin: Support for librdkafka 0.9.0 has been added. Thanks to Florian Forster.

• Write Riemann plugin: Build issues on Solaris have been fixed. Thanks to Florian Forster.

更多改进内容请看更新日志。

下载地址：

• http://collectd-5.5.3.tar.bz2/

collectd是一个守护(daemon)进程，用来收集系统性能和提供各种存储方式来存储不同值的机制。比如以RRD 文件形式。

当系统运行和存储信息的时候，Collectd会周期性统计系统的相关统计信息。那些信息可以用来找到当前系统性能瓶颈。（如作为性能分析 performance analysis）和预测系统未来的load（如能力部署capacity planning）.如果你需要美观的图形来显示您的数据，并且已经厌烦了内部解决方案，恭喜您，你找到了正确的地方。

一般来说，一图胜过千言，所以这里显示了某个系统在过去60分钟内的CPU利用率图形。