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feature/loki-log-queries #7

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torjus merged 2 commits from feature/loki-log-queries into master 2026-02-05 20:06:34 +00:00
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torjus commented 2026-02-05 20:02:59 +00:00
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Summary

Add Loki log query support to the lab-monitoring MCP server. Three new tools are registered when LOKI_URL is configured (opt-in):

  • query_logs — Execute LogQL range queries against Loki with configurable time range, limit (capped at 5000), and direction
  • list_labels — List available label names from Loki
  • list_label_values — List values for a specific label

Changes

  • Loki HTTP client (internal/monitoring/loki.go) — LokiClient with QueryRange, Labels, and LabelValues methods, following the same pattern as PrometheusClient
  • Handlers (internal/monitoring/handlers.go) — RegisterHandlers now accepts an optional *LokiClient; tools are conditionally registered when non-nil. Includes parseTimeArg helper supporting relative durations, RFC3339, and Unix epoch
  • Formatting (internal/monitoring/format.go) — formatLogStreams, formatLabels, formatLabelValues for markdown output
  • CLI commands (cmd/lab-monitoring/main.go) — logs and labels subcommands, --loki-url global flag / LOKI_URL env var
  • NixOS module (nix/lab-monitoring-module.nix) — lokiUrl option (nullOr str, default null), conditionally sets LOKI_URL env var
  • Version bump — lab-monitoring 0.1.0 → 0.2.0

Security hardening

  • Log query limit parameter capped at 5000 to prevent unbounded memory usage
  • direction parameter validated server-side against allowed values

Tests

  • 5 new Loki client tests (loki_test.go)
  • 4 new handler tests (QueryLogs, ListLabels, ListLabelValues, ToolCountWithLoki)
  • All existing tests unaffected

Verification

  • go test ./... -short — all pass
  • golangci-lint run ./... — 0 issues
  • go vet ./... — clean
  • nix build .#lab-monitoring — builds successfully
## Summary Add Loki log query support to the lab-monitoring MCP server. Three new tools are registered when `LOKI_URL` is configured (opt-in): - **`query_logs`** — Execute LogQL range queries against Loki with configurable time range, limit (capped at 5000), and direction - **`list_labels`** — List available label names from Loki - **`list_label_values`** — List values for a specific label ### Changes - **Loki HTTP client** (`internal/monitoring/loki.go`) — `LokiClient` with `QueryRange`, `Labels`, and `LabelValues` methods, following the same pattern as `PrometheusClient` - **Handlers** (`internal/monitoring/handlers.go`) — `RegisterHandlers` now accepts an optional `*LokiClient`; tools are conditionally registered when non-nil. Includes `parseTimeArg` helper supporting relative durations, RFC3339, and Unix epoch - **Formatting** (`internal/monitoring/format.go`) — `formatLogStreams`, `formatLabels`, `formatLabelValues` for markdown output - **CLI commands** (`cmd/lab-monitoring/main.go`) — `logs` and `labels` subcommands, `--loki-url` global flag / `LOKI_URL` env var - **NixOS module** (`nix/lab-monitoring-module.nix`) — `lokiUrl` option (nullOr str, default null), conditionally sets `LOKI_URL` env var - **Version bump** — lab-monitoring `0.1.0` → `0.2.0` ### Security hardening - Log query `limit` parameter capped at 5000 to prevent unbounded memory usage - `direction` parameter validated server-side against allowed values ### Tests - 5 new Loki client tests (`loki_test.go`) - 4 new handler tests (QueryLogs, ListLabels, ListLabelValues, ToolCountWithLoki) - All existing tests unaffected ### Verification - `go test ./... -short` — all pass - `golangci-lint run ./...` — 0 issues - `go vet ./...` — clean - `nix build .#lab-monitoring` — builds successfully
torjus added 2 commits 2026-02-05 20:02:59 +00:00
feat: add Loki log query support to lab-monitoring 859e35ab5c 
Add 3 opt-in Loki tools (query_logs, list_labels, list_label_values)
that are registered when LOKI_URL is configured. Includes Loki HTTP
client, CLI commands (logs, labels), NixOS module option, formatting,
and tests.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
fix: cap log query limit and validate direction parameter d97e554dfc 
Prevent unbounded memory usage by capping the limit parameter to 5000.
Validate direction against allowed values instead of passing through
to Loki unchecked.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
torjus merged commit 9dfe61e170 into master 2026-02-05 20:06:34 +00:00
torjus deleted branch feature/loki-log-queries 2026-02-05 20:06:34 +00:00
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Reference: torjus/labmcp#7
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