Grafana Loki

JSONL execution traces can be shipped to Loki and queried with LogQL in Grafana dashboards.

Setup

Ship JSONL traces to Loki using promtail, Grafana Alloy, or any Loki-compatible agent. The simplest approach appends traces to a log file that your agent tails:

# In your CI pipeline, after each build:
grog traces export --format=jsonl --limit 1 >> /var/log/grog-traces.jsonl

Configure your Loki agent to tail this file with a grog label:

# promtail config snippet
scrape_configs:
  - job_name: grog-traces
    static_configs:
      - targets: [localhost]
        labels:
          job: grog
          __path__: /var/log/grog-traces.jsonl

Grafana dashboard queries

With traces in Loki, use LogQL in Grafana to build dashboards:

Build duration over time:

{job="grog"} | json | line_format "{{.total_duration_millis}}"

Filter to failed builds:

{job="grog"} | json | failure_count > 0

Extract cache hit rate:

{job="grog"} | json | unwrap cache_hit_count | __error__=""