WATCHLOG PRODUCT · AI

Observe your AI applications the same way you observe everything else.

Trace LLM API calls, monitor prompt and response content, measure token usage, and track latency and error rates for every GenAI application you run.

AI
Prompt + response traces·Token cost attribution·Latency by model
THE PROBLEM

AI applications are black boxes without observability.

Your GenAI feature calls GPT-4 or Claude dozens of times per user session. You have no visibility into which prompts are failing, which calls are slow, which sessions are expensive, or why the AI response quality has degraded since the last deploy.

LLM errors are silent
A malformed prompt that returns an empty completion looks like a successful HTTP 200 call.
Token costs are opaque
Which feature, which user, which session is responsible for your $4,000 OpenAI bill this month?
Latency is hard to optimize
A slow AI response degrades the entire user experience. Without per-call traces, you cannot find the slow prompt.
WHAT'S MONITORED

Everything LLM Monitoring captures.

Real signals collected by the Watchlog Agent — available in your dashboard within 60 seconds of enabling.

LLM call tracing
Every LLM API call traced as a span — model, prompt, response, latency, token count, and cost.
Prompt and response capture
Full prompt and completion stored per trace with privacy masking options for sensitive content.
Token usage tracking
Prompt tokens, completion tokens, and total tokens tracked per call, per session, and per feature.
Latency by model and endpoint
p50, p95, and p99 latency per LLM model and API endpoint with historical trending.
Cost attribution
Token cost calculated and attributed to sessions, features, users, and teams for budget control.
Error rate tracking
Rate limit errors, timeout errors, content filter rejections, and empty completions tracked separately.
LIVE VIEW

LLM trace — every call visible.

See the prompt, completion, token count, latency, and cost for every LLM call in your application.

LLM Monitoring  ·  Live
LLM Trace #8821  ·  Session: user_44821  ·  Feature: AI Summary
openai / gpt-4o142 prompt tokens·284 completion tokens·1,420ms·$0.012
PROMPT
You are a helpful assistant. Summarize the following support ticket in under 3 sentences...
COMPLETION
Customer is experiencing login failures on mobile devices. The issue began after...
Total tokens: 426|Est. cost: $0.012|Latency: 1,420ms|Model: gpt-4o
CAPABILITIES

What LLM Monitoring gives you.

Full call tracing
Every LLM API call traced end-to-end — from application code through the API response.
Prompt history
Searchable prompt and completion history — find the exact call that returned a bad response.
Token budget tracking
Set token budgets per feature or team and alert when usage approaches the limit.
Rate limit monitoring
Track 429 rate limit errors per model and endpoint — plan capacity before limits hit production.
Session cost attribution
Understand which user sessions, features, and user segments are driving the most LLM cost.
Multi-provider support
Instrument OpenAI, Anthropic, Cohere, Google Vertex, and any OpenAI-compatible endpoint.
USE CASES

How engineering teams use LLM Monitoring.

AI feature cost control
Your AI summarizer costs $8,000/month. LLM Monitoring shows 30% of cost comes from a bug that retries failed calls unnecessarily.
CostOptimizationToken Usage
Prompt debugging
Users report the AI gives wrong answers. Prompt history shows the system prompt was truncated after a deploy. Issue found in 2 minutes.
DebuggingPromptsQuality
Latency investigation
AI chat responses are slow. LLM traces show p95 latency of 8s on gpt-4 calls. Switching to gpt-4o-mini for short queries cuts p95 to 1.2s.
LatencyModel SelectionPerformance
Rate limit planning
LLM Monitoring shows rate limit errors increasing 40% week-over-week. Engineering has time to request a tier upgrade before it impacts users.
Rate LimitsCapacityPlanning
PLATFORM FIT

LLM Monitoring inside the Watchlog platform.

LLM Monitoring is built on the same tracing infrastructure as APM — LLM calls appear as spans in your distributed traces, and AI Analysis can correlate LLM errors with infrastructure incidents.

APM
LLM spans in distributed traces
Alerts
Alert on cost, latency, or error rate
AI Analysis
LLM errors as root cause signals
QUICK START

Start LLM Monitoring in under 2 minutes.

No YAML. No complex configuration. The Watchlog Agent handles discovery automatically.

01
Open GenAI Documentation
Start from the GenAI Monitoring documentation and choose the metric you want to evaluate.
https://docs.watchlog.io/get-started/Gen-AI-Monitoring.html
02
Get Your API Key
Copy your API key from the GenAI Control Room in the Watchlog dashboard.
03
Send GenAI Evaluation Requests
Call Watchlog GenAI APIs to evaluate prompts and responses for hallucination, similarity, sentiment, PII, prompt injection, and other AI quality metrics.
https://gen-ai.watchlog.io/api/v1/monitoring/metrics
GET STARTED

Start monitoring with LLM Monitoring.

Full LLM call visibility — prompt, completion, tokens, latency, and cost per call.

Questions? Talk to us → [email protected]