| `Maximum field length` | See [the explanation in instance limits.](../administration/instance_limits.md#maximum-field-length). |
| `Maximum bulk request size (MiB)` | Repository indexing uses the Elasticsearch bulk request API. This setting determines the maximum size of an individual bulk request during these operations. |
| `Bulk request concurrency` | Each repository indexing operation may submit bulk requests in parallel. This increases indexing performance, but fills the Elasticsearch bulk requests queue faster. |
| `type` | string | yes | Type of panel to be rendered. For stacked column panel types, set to `stacked-column` |
| `query_range` | yes | yes | For stacked column panel types, you must use a [range query](https://prometheus.io/docs/prometheus/latest/querying/api/#range-queries) |
##### Single Stat
To add a single stat panel type to a dashboard, look at the following sample dashboard file:
> [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/460) in [GitLab Premium](https://about.gitlab.com/pricing/) 12.8.
Approval rules are often only relevant to specific branches, like `master`.
When configuring [**Default Approval Rules**](#adding--editing-a-default-approval-rule)
these can be scoped to all the protected branches at once by navigating to your project's
**Settings**, expanding **Merge request approvals**, and selecting **Any branch** from
the **Target branch** dropdown.
Alternatively, you can select a very specific protected branch from the **Target branch** dropdown:
![Scoped to Protected Branch](img/scoped_to_protected_branch_v12_8.png)
To enable this configuration, see [Code Owner’s approvals for protected branches](../protected_branches.md#protected-branches-approval-by-code-owners-premium).
## Adding or removing an approval
When an [eligible approver](#eligible-approvers) visits an open merge request,
=_('If any indexed field exceeds this limit it will be truncated to this number of characters and the rest will not be indexed or searchable. This does not apply to repository and wiki indexing. Setting this to 0 means it is unlimited.')