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https://issues.apache.org/jira/browse/TS-4099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15111852#comment-15111852
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ASF subversion and git services commented on TS-4099:
-----------------------------------------------------
Commit 1a590016ae2dd2e1f868a57eec668cda886c4368 in trafficserver's branch
refs/heads/master from [[email protected]]
[ https://git-wip-us.apache.org/repos/asf?p=trafficserver.git;h=1a59001 ]
TS-4099: add Lua bindings for custom metrics
Implement custom metrics in terms of Lua bindings. We export a
minimal API that constructs metrics and implicitly registers an
evaluation function. We periodically evaluate all the evaluation
functions and update their corresponding metrics.
Metrics are implicitly registered when they are loaded, so there
is no need to mention anything in mgmt/RecordsConfig.cc.
The metrics registration and evaluation syntax looks like this:
integer 'proxy.node.http.user_agents_total_documents_served' [[
proxy.process.http.incoming_requests
]]
> replace XML statistics with Lua
> -------------------------------
>
> Key: TS-4099
> URL: https://issues.apache.org/jira/browse/TS-4099
> Project: Traffic Server
> Issue Type: New Feature
> Components: Lua, Manager, Metrics
> Reporter: James Peach
> Assignee: James Peach
> Fix For: 6.2.0
>
>
> The custom metrics XML format is undocumented and difficult to use and
> extend. Since we plan to use Lua for configuration programmability, lets make
> a start by replacing this subsystem with Lua.
> It turns out that Lua is mostly more readable and easier to understand.
> Performance is roughly similar.
> Example syntax:
> {code}
> float 'proxy.node.user_agent_total_bytes_avg_10s' [[
> local self = ...
> return interval_delta_of_10s(self, function()
> return proxy.node.user_agent_total_bytes
> end)
> ]]
> counter 'proxy.node.origin_server_total_bytes' [[
> return proxy.node.http.origin_server_total_request_bytes +
> proxy.node.http.origin_server_total_response_bytes +
> proxy.node.http.parent_proxy_total_request_bytes +
> proxy.node.http.parent_proxy_total_response_bytes
> ]]
> {code}
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