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Grafana Loki

Safety: 65/100

0.0(0)

Grafana Loki MCP server enables querying and formatting Loki logs via Grafana's API, offering flexible data retrieval and presentation options.

MCP ServersFreemium

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Overview

Grafana Loki MCP server enables querying and formatting Loki logs via Grafana's API, offering flexible data retrieval and presentation options.

This MCP server is relatively safe for querying and formatting Loki logs, provided the Grafana API key is securely managed and access is appropriately controlled. Risks are elevated if the API key is exposed or if log data contains sensitive information without proper redaction.

Performance depends on the complexity of Loki queries and the size of the log data. Optimize queries for efficiency and consider using Loki's indexing capabilities.

Cost is primarily associated with Grafana API usage and any associated data transfer fees. Optimize queries and cache results to minimize costs.

HybridPython20 starsMITCI/CD

Connections & Capabilities

Connects To

GitHub

Capabilities

Read

Client Compatibility

Claude Desktop

full

Cursor

untested

Windsurf

untested

VS Code (Copilot)

untested

Quickstart

Install

pip install grafana-loki-mcp

Claude Desktop Config

{
  "mcpServers": {
    "loki": {
      "command": "uvx",
      "args": [
        "grafana-loki-mcp",
        "-u",
        "GRAFANA_URL",
        "-k",
        "GRAFANA_API_KEY"
      ]
    }
  }
}

Environment Variables

GRAFANA_URLGRAFANA_API_KEY

Tools (4)

safe

query_loki

Queries Loki logs based on a provided query string and time range.

Read-only operation; retrieves log data without modification.

safe

get_loki_labels

Retrieves all label names from Loki.

Read-only operation; retrieves label names without modification.

safe

get_loki_label_values

Retrieves values for a specific label from Loki.

Read-only operation; retrieves label values without modification.

safe

format_loki_results

Formats Loki query results into a more readable format.

Read-only operation; transforms data without modifying the source.

Security

Auth Method

API Key

Data Locality

hybrid

Known Risks

!Compromised Grafana API key leading to unauthorized log access.
!Exposure of sensitive information within log data.
!Potential for denial-of-service if the server is overwhelmed with requests.
!Lack of input validation could lead to query injection vulnerabilities.

Safety Score

moderate risk

Positive

+Uses Grafana API for querying, leveraging existing Grafana access controls.
+Read-only access to logs via `query_loki`, `get_loki_labels`, and `get_loki_label_values`.
+Formatting tool `format_loki_results` does not modify any data.
+Supports both stdio and SSE transport protocols for secure communication.

Risks

-Requires a Grafana API key, which if compromised, could expose log data.
-Exposure of Grafana URL and API key as environment variables or command-line arguments.
-Potential for information leakage if log data contains sensitive information.
-No built-in rate limiting, potentially leading to API abuse if not managed externally.

Use Cases

Log Analysis

-Troubleshooting application errors by querying logs.
-Identifying trends and patterns in log data.
-Monitoring system performance through log analysis.

Security Monitoring

-Detecting suspicious activity by analyzing security logs.
-Investigating security incidents by querying relevant logs.
-Auditing user access and activity through log data.

Application Debugging

-Pinpointing the source of errors in application code.
-Tracking application behavior through detailed logs.
-Analyzing performance bottlenecks by examining log timestamps.

Who Is This For?

Best For

Teams using Grafana Loki for log aggregation.
Developers needing to query logs for debugging.
Security analysts monitoring logs for threats.
Operations teams tracking system performance.

Not Ideal For

Environments without Grafana Loki.
Use cases requiring real-time log analysis with extremely low latency.
Situations where direct access to the underlying log storage is needed.

Autonomy & Execution

Default ModeRead-only

Sandboxed

The server primarily supports read-only operations, limiting the risk of unintended modifications. However, ensure the Grafana API key has restricted permissions to further minimize potential impact.

StatelessYes

Retry LogicNot documented

ConcurrencyNot documented

Production Tip

Monitor the Grafana API usage to prevent rate limiting or unexpected costs. Implement caching to reduce redundant queries.

FAQ

What permissions are required for the Grafana API key?

The API key needs permissions to query Loki logs. Read-only permissions are sufficient for the provided tools.

How do I secure the Grafana API key?

Store the API key securely using environment variables or a secrets management system. Avoid hardcoding it in your code.

What happens if the Grafana API is unavailable?

The MCP server will be unable to query Loki logs, and requests will likely result in errors.

Can I use this server to write logs to Loki?

No, this server is designed for querying and formatting logs, not writing them.

How do I handle rate limiting from the Grafana API?

Implement retry logic with exponential backoff in your client code. Monitor API usage to anticipate and prevent rate limits.

What time formats are supported for the start and end parameters?

ISO format, Unix timestamps, and Grafana-style relative times (e.g., 'now-1h') are supported.

How can I limit the amount of data returned by a query?

Use the `limit` parameter in the `query_loki` tool to specify the maximum number of log lines to return.

Metrics

Discovered2/14/2026

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