Feature Request: Add update_incident tool (resolve, assign, update status/severity)

Summary

The current incident toolset only supports create_incident, get_incident, list_incidents, and add_activity_to_incident. There is no way to update an existing incident — specifically to resolve it or assign it to a user/team — through the MCP server.

Motivation

In an on-call/triage workflow, the most common actions after creating an incident are:

1. Assigning it to the engineer on-call or a specific team
2. Resolving it once the issue is fixed

Without these, an AI agent using the Grafana MCP can open incidents but cannot close the loop — forcing the engineer to switch to the Grafana Incident UI for basic lifecycle management.

Proposed Solution

Add an update_incident tool (gated behind enableWriteTools like create_incident) that wraps the existing Grafana Incident API update endpoint.

type UpdateIncidentParams struct {
    IncidentID string `json:"incidentId" jsonschema:"description=The ID of the incident to update"`
    Status     string `json:"status,omitempty" jsonschema:"description=New status: 'active' or 'resolved'"`
    Severity   string `json:"severity,omitempty" jsonschema:"description=New severity level"`
    AssignedTo string `json:"assignedTo,omitempty" jsonschema:"description=User or team to assign the incident to"`
    Title      string `json:"title,omitempty" jsonschema:"description=Updated incident title"`
}

Use Cases

• AI on-call agent resolves a Grafana incident after confirming the fix is deployed
• AI agent assigns an incident to the on-call engineer automatically after triage
• Updating severity after root cause is identified (e.g. downgrade from critical to minor)

Current Workaround

Using add_activity_to_incident to log a note like "Resolved — assigned to @engineer" is the only option today, but this doesn't actually change the incident state.

Related

• tools/incident.go — where the new tool would live alongside CreateIncident and AddActivityToIncident
• The enableWriteTools gate should apply here as well