…urrency

This change introduces two flags that control if rule evaluation concurrently.

First, you have a flag that controls the total amount of rules that can be running concurrently at any given time per ruler replica with:

`-ruler.max-global-rule-evaluation-concurrency`

Then, this is paired with `-ruler.max-concurrent-rule-evaluations-per-tenant` to control the amount of rules a single tenant is allowed to have concurrently. By default, this is `4`. However, the behaviour is disabled by default because `-ruler.max-global-rule-evaluation-concurrency` is set to `0` by default.

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Co-authored-by: Taylor C <41653732+tacole02@users.noreply.github.com>

…verride

Signed-off-by: gotjosh <josue.abreu@gmail.com>

…rimental

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Signed-off-by: gotjosh <josue.abreu@gmail.com>

- rename the threshold flag to include the suffix percentange
- adjust the variable names for the threhold accordingly
- incorporate taylor's feedback on the changelog

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Signed-off-by: gotjosh <josue.abreu@gmail.com>

Signed-off-by: gotjosh <josue.abreu@gmail.com>