[jira] [Commented] (TS-4099) replace XML statistics with Lua

["Leif Hedstrom (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TS-4099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15091274#comment-15091274 ] 

Leif Hedstrom commented on TS-4099:
-----------------------------------

I think we should make sure that we can continue debugging / testing with ASAN if we introduce Lua in the core. Even if it just means adding a configure option to use a different Lua library when building both the core and the Lua plugin.

> 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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