Adding upstream version 1.1.0.upstream/1.1.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Upgrading Icinga DB
+
+Specific version upgrades are described below. Please note that version upgrades are incremental.
+If you are upgrading across multiple versions, make sure to follow the steps for each of them.
+
+## Upgrading to Icinga DB v1.0
+
+**Requirements**
+
+* You need at least Icinga 2 version 2.13.4 to run Icinga DB v1.0.0.
+
+**Database Schema**
+
+* For MySQL databases, please apply the `1.0.0.sql` upgrade script.
+  For package installations, you can find this file at `/usr/share/doc/icingadb/schema/mysql/upgrades/`.
+
+## Upgrading to Icinga DB RC2
+
+Icinga DB RC2 is a complete rewrite compared to RC1. Because of this, a lot has changed in the Redis and database
+schema, which is why they have to be deleted and recreated. The configuration file has changed from `icingadb.ini`
+to `config.yml`. Instead of the INI format, we are now using YAML and have introduced more configuration options. We
+have also changed the packages of `icingadb-redis`, which is why the Redis CLI commands are now prefixed with `icingadb`
+instead of just `icinga`, i.e. the Redis CLI is now accessed via `icingadb-redis-cli`.
+
+Please follow the steps below to upgrade to Icinga DB RC2:
+
+1. Stop Icinga 2 and Icinga DB.
+2. Flush your Redis instances using `icinga-redis-cli flushall` (note the `icinga` prefix as we did not
+   upgrade `icingadb-redis` yet) and stop them afterwards.
+3. Upgrade Icinga 2 to version 2.13.2 or newer.
+4. Remove the `icinga-redis` package where installed as it may conflict with `icingadb-redis`.
+5. Install Icinga DB Redis (`icingadb-redis`) on your primary Icinga 2 nodes to version 6.2.6 or newer.
+6. Upgrade Icinga DB to RC2.
+7. Drop the Icinga DB MySQL database and recreate it using the provided schema.
+8. Start Icinga DB Redis, Icinga 2 and Icinga DB.