Viewing abuse filter 1: Observation: possible mass content removal

Filter parameters

Filter ID:

1

Description:

(publicly viewable)

Statistics:

Of the last 4 actions, this filter has matched 0 (0%). On average, its run time is 1.8 ms, and it consumes 2 conditions of the condition limit.

Conditions:

!("bot" in user_groups) & !("sysop" in user_groups) & old_size > 1500 & new_size < old_size * 0.15 & article_namespace != 10 & article_namespace != 828

!("bot" in user_groups) & !("sysop" in user_groups) & old_size > 1500 & new_size < old_size * 0.15 & article_namespace != 10 & article_namespace != 828

Notes:

Log-only, does not block. Flags edits that remove >85% of a page's content when the page was already substantial (>1500 bytes) -- a common vandalism/blanking pattern. Excludes bots and sysops (staff maintenance) to reduce noise. Excludes Template (10) and Module (828) namespaces since legitimate large refactors are routine there. Does not fire on large *additions*, only shrinkage, so it should not catch legitimate substantial rewrites/expansions. 2026-08-18 hardening pass.

Flags:

Suppress this filter so that only suppressors can view it and its logs

Hide details of this filter from public view

Enable this filter

Mark as deleted

Filter last modified:

03:19, 18 August 2026 by EDFM Site Maintenance (talk | contribs)

History:

View this filter's history

Tools:

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{"data":{"rules":"!(\"bot\" in user_groups) \u0026 !(\"sysop\" in user_groups) \u0026 old_size \u003E 1500 \u0026 new_size \u003C old_size * 0.15 \u0026 article_namespace != 10 \u0026 article_namespace != 828","name":"Observation: possible mass content removal","comments":"Log-only, does not block. Flags edits that remove \u003E85% of a page's content when the page was already substantial (\u003E1500 bytes) -- a common vandalism/blanking pattern. Excludes bots and sysops (staff maintenance) to reduce noise. Excludes Template (10) and Module (828) namespaces since legitimate large refactors are routine there. Does not fire on large *additions*, only shrinkage, so it should not catch legitimate substantial rewrites/expansions. 2026-08-18 hardening pass.","group":"default","actions":{"tag":["possible-mass-blanking"]},"enabled":true,"deleted":false,"privacylevel":0,"global":false},"actions":{"tag":["possible-mass-blanking"]}}

Actions to take when matched

Trigger actions only if the user trips a rate limit

Number of actions to allow:

Period of time (in seconds):

Group throttle by:

user

See the documentation on mediawiki.org.

Trigger these actions after giving the user a warning

System message to use for warning:

Page name of other message:

(without "MediaWiki:" prefix)

Prevent the user from performing the action in question

System message to use for disallowing:

Page name of other message:

(without "MediaWiki:" prefix)

Revoke the user's autoconfirmed status

Block the user and/or IP address from editing

Block the user and/or IP address from editing their own talk page

Block duration for non-registered users:

Block duration for registered users:

Tag the edit for further review

Tags to apply:

possible-mass-blanking

Viewing abuse filter 1: Observation: possible mass content removal

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