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https://issues.apache.org/jira/browse/SOLR-9898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15795443#comment-15795443
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Andrzej Bialecki commented on SOLR-9898:
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h1. Directory I/O metrics
Index storage (represented in Lucene/Solr by {{Directory}} abstraction) is
monitored for I/O throughput, which is optionally tracked per index file (see
the previous section, {{directoryDetails}} argument). As with the index-level
metrics, these metrics are also registered in per-core registries.
The following metrics are collected:
* {{DIRECTORY.total.reads}} - meter for total read bytes from the directory.
* {{DIRECTORY.total.writes}} - meter for total written bytes to the directory.
If {{directoryDetails}} is set to true the following additional metrics are
collected (note: this can potentially produce a lot of metrics so it should not
be used in production):
* {{DIRECTORY.total.readSizes}} - histogram of read operation sizes (in byte
units)
* {{DIRECTORY.total.writeSizes}} - histogram of write operation sizes (in byte
units)
* {{DIRECTORY.<file type>.reads}} - meter for read bytes per "file type". File
type is either {{segments}} for {{segments_N}} and {{pending_segments_N}}, or a
file extension (eg. {{fdt}}, {{doc}}, {{tim}}, etc). The number and type of
these files vary depending on the type of Lucene {{Codec}} used.
* {{DIRECTORY.<file type>.writes}} - meter for written bytes per "file type".
* {{DIRECTORY.<file type>.readSizes}} - histogram of write operation sizes per
"file type" (in byte units).
* {{DIRECTORY.<file type>.writeSizes}} - histogram of write operation sizes
per "file type" (in byte units).
> Documentation for metrics collection and /admin/metrics
> -------------------------------------------------------
>
> Key: SOLR-9898
> URL: https://issues.apache.org/jira/browse/SOLR-9898
> Project: Solr
> Issue Type: Task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: documentation
> Affects Versions: master (7.0), 6.4
> Reporter: Andrzej Bialecki
> Assignee: Cassandra Targett
>
> Draft documentation follows.
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