We'd like to request a 30 minutes read-only time window for the following wikis to perform maintenance on their primary database master:
Affected wikis:

altwiki
apiportalwiki
arbcom_ruwiki
avkwiki
bclwiktionary
cebwiki
dewiki
diqwiktionary
enwikivoyage
eowikivoyage
jawikivoyage
lldwiki
madwiki
mgwiktionary
mhwiktionary
mniwiki
mniwiktionary
mnwwiktionary
muswiki
niawiki
niawiktionary
shwiki
skrwiki
skrwiktionary
smnwiki
srwiki
taywiki
thankyouwiki
trvwiki
trwikivoyage
wawikisource

Impact: Those wikis will go read-only for around 30 minutes (hopefully a lot less). Reads will not be impacted
When: Tuesday 22nd June at 05:00 AM UTC