The phrase "alert for all" is correct and usable in written English.
It can be used to indicate that a notification or warning is intended for everyone or is applicable to all individuals involved.
Example: "The system will send an alert for all users when the maintenance is scheduled."
Alternatives: "notification for everyone" or "warning for all".
Just in time for the summer tourist season, the State Department has issued a new travel alert for all of Europe because of the threat of terrorist attacks on the continent.
Barrett, a former sparring partner for champion boxers, had to stay upright and alert for all seven hours and 561 pitches of Game 3. Prayer, and a ball boy bringing him liquids, helped him through.
Many research projects have been launched to meet the mission-critical requirement of PSN, e.g., Aerial Base Station with Opportunistic Links for Unexpected & TEmporary events (ABSOLUTE), Alert for All (Alert4All), Mobile Alert InformAtion system using satellites (MAIA) [4].
SPOILER ALERT for all the 2015 Best Picture nominees!
The Pacific Tsunami Warning Center issued an alert for all of Latin America's Pacific coast.
Chinese democracy is: An update of the "Redeem Team's" gold medal Olympic men's basketball victory on CBS Sunday Morning without even that the decency of offering a spoiler alert for all us hoops fans who DVRed the thrilling game and didn't want to know the outcome.
There are also 11 flood warnings and 14 flood alerts for all river catchments in Cumbria.
Public Health England PHEE) has issued level two alerts for all regions – apart from the south-west, south-east and London – and urged people to look out for their family, friends and neighbours.
We also like that they have RSS feeds and email alerts for all categories and search results.
MACCS descriptors were not effective in detecting structural alerts for all data sets, but mutagenicity, where eight descriptors detected mostly nitro groups.
For the first time, audiences can use the BBC Sport mobile and tablet apps to receive medal alerts for all the countries they want to follow, including all the Home Nations.
