[jira] [Resolved] (NUTCH-3132) Standardize existing Nutch metrics naming and implementation

["Lewis John McGibbney (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NUTCH-3132?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lewis John McGibbney resolved NUTCH-3132.
-----------------------------------------
    Resolution: Fixed

> Standardize existing Nutch metrics naming and implementation
> ------------------------------------------------------------
>
>                 Key: NUTCH-3132
>                 URL: https://issues.apache.org/jira/browse/NUTCH-3132
>             Project: Nutch
>          Issue Type: Sub-task
>          Components: metrics
>            Reporter: Lewis John McGibbney
>            Assignee: Lewis John McGibbney
>            Priority: Major
>             Fix For: 1.22
>
>
> This task will create a centralized metrics constants class following [Prometheus naming conventions|https://prometheus.io/docs/practices/naming/], cache counter references to reduce lookup overhead, and standardize naming across the codebase. This affects 88 counter operations in 17 files.
> Following [Prometheus best practices|https://prometheus.io/docs/practices/naming/]:
>  
> ||Rule ||Convention||Example||
> |Prefix|Application namespace {{nutch_}}|{{nutch_fetcher_...}}|
> |Units|Base units as suffix|{{{}_bytes{}}}, {{_seconds}}|
> |Counts|{{_total}} suffix|{{pages_fetched_total}}|
> |Case|snake_case|{{robots_denied}} not {{RobotsDenied}}|
> h2. Counter Group Mapping
> ||Current||Prometheus-style||
> |{{FetcherStatus}}|{{nutch_fetcher}}|
> |{{Generator}}|{{nutch_generator}}|
> |{{IndexerStatus}}|{{nutch_indexer}}|
> |{{CrawlDB status}}|{{nutch_crawldb}}|
> |{{injector}}|{{nutch_injector}}|
> |{{UpdateHostDb}}|{{nutch_hostdb}}|
> |{{ParserStatus}}|{{nutch_parser}}|
> h2. Counter Name Mapping (examples)
> ||Current||Prometheus||
> |{{bytes_downloaded}}|{{bytes_downloaded_total}}|
> |{{robots_denied}}|{{robots_denied_total}}|
> |{{URL_FILTERS_REJECTED}}|{{urls_filtered_total}}|
> |{{urls_injected}}|{{urls_injected_total}}|
> |{{indexed (add/update)}}|{{docs_indexed_total}}|
>  



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