Call to deprecated function db_truncate(). Deprecated in drupal:8.0.0 and is removed from drupal:9.0.0. Instead, get a database connection injected into your service from the container and call truncate() on it. For example,

Total occurrences Projects affected Topmost group Category
10 8 200 Not covered by rector
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download_count 1.x-dev 10000 2
time_spent_all 2.1 10000 2
login_security 1.x-dev 200 1
suggestion 1.x-dev 10000 1
japan_postal_code 1.x-dev 10000 1
concurrent_users_notification 1.x-dev 10000 1
skimlinks 1.x-dev 10000 1
stockapi 2.x-dev 10000 1