Upgrading Drupal

Hello all, I am attempting to upgrade/migrate from from a mus behaving D7 to a clean D8, D9, D10. 

The actual process works well, except for the migration of the comments module.  I have searched for a solution without success. I am hoping someone could provide advice or if willing, perform the upgrade for me. 

The error in the migrate UI is:

Migration d7_comment did not meet the requirements. Missing migrations d7_node_complete:story. requirements: d7_node_complete:story

Hallo folks, 

I took over a Drupal site from another admin. How can I tell if Drupal was installed with Composer? I myself have always installed Drupal manually and always carried out all updates manually.

Ulrike

In https://www.drupal.org/psa-2022-02-23, where it was announced the extension to Drupal 7's end-of-life date to 1 November 2023, it was also stated that: "We will announce by July 2023 whether we will extend Drupal 7 community support an additional year. " 

I inherited a Drupal site. When I attempt to switch php I receive the following error.

Fatal error: Declaration of Drupal\Core\Database\Statement::fetchAll($mode = null, $column_index = null, $constructor_arguments = null) must be compatible with PDOStatement::fetchAll(int $mode = PDO::FETCH_DEFAULT, mixed ...$args) in /core/lib/Drupal/Core/Database/Statement.php on line 169

Do I need to update Core before I can update php?

Thank you.

each upgrade come generally with some DB updates, this may change some table schema as well as some configurations..

in the deployment process, the steps I use (after upgrading using composer and push the composer files) as follow:

I had an old Debian 2 releases behind stable with drupal7 from debs. The drupal was so unmaintained that it got hacked and started to send spam all over, so I decided to upgrade it. For that, I removed the packages (but not the site) and upgraded the machine to stable again. So far so good.

In that upgrade process I also backed up and restored the D7 db from PG 9.1 to PG 13 (the new PG version in stable), and now I want to 'upgrade' the old setup by 'installing a fresh drupal'; meaning, I want to install drupal the new ways (with composer) while kind of upgrading the old db.