redis-observability

Redis observability guidance — which metrics to monitor (memory, connections, hit ratio, ops/sec, rejected connections), which built-in commands to reach for during incident triage (SLOWLOG, INFO, MEMORY DOCTOR, CLIENT LIST, FT.PROFILE), and when to use the Redis Insight GUI. Use when setting up monitoring or alerts for a Redis instance, diagnosing a performance regression, profiling a slow FT.SEARCH query, or wiring Redis metrics into Prometheus, Datadog, or similar.

name: redis-observability description: Redis observability guidance — which metrics to monitor (memory, connections, hit ratio, ops/sec, rejected connections), which built-in commands to reach for during incident triage (SLOWLOG, INFO, MEMORY DOCTOR, CLIENT LIST, FT.PROFILE), and when to use the Redis Insight GUI. Use when setting up monitoring or alerts for a Redis instance, diagnosing a performance regression, profiling a slow FT.SEARCH query, or wiring Redis metrics into Prometheus, Datadog, or similar. license: MIT metadata: author: Redis, Inc. version: "0.1.0"

Redis Observability

What to watch, what to run, and what to alert on. Covers the metrics every Redis deployment should monitor and the built-in commands for ad-hoc diagnosis.

When to apply

Setting up monitoring or alerts for a Redis instance.
Diagnosing a Redis performance regression (high latency, memory pressure, connection storms).
Profiling a slow FT.SEARCH or pipeline.
Wiring Redis metrics into Prometheus, Datadog, CloudWatch, or similar.

1. Monitor these metrics

These come from INFO and should be exported to your monitoring system.

Metric	What it tells you	Alert when
`used_memory`	Current memory usage	> 80% of `maxmemory`
`connected_clients`	Open connections	Sudden spikes or drops
`blocked_clients`	Clients waiting on blocking ops	> 0 sustained
`instantaneous_ops_per_sec`	Current throughput	Significant drops
`keyspace_hits` / `keyspace_misses`	Cache hit ratio	Hit ratio < 80%
`rejected_connections`	Hit `maxclients` cap	> 0
`rdb_last_save_time`	Last persistence snapshot	Too old vs. RPO

info = redis.info()
hit_ratio = info["keyspace_hits"] / max(1, info["keyspace_hits"] + info["keyspace_misses"])
print(f"Memory:    {info['used_memory_human']}")
print(f"Clients:   {info['connected_clients']}")
print(f"Ops/sec:   {info['instantaneous_ops_per_sec']}")
print(f"Hit ratio: {hit_ratio:.1%}")

See references/metrics.md.

2. Built-in commands for debugging

Reach for these when something looks off.

Topic	Command
Slow commands	`SLOWLOG GET 10` / `SLOWLOG LEN` / `SLOWLOG RESET`
Server snapshot	`INFO all` (or `INFO memory` / `INFO stats` / `INFO clients` / `INFO replication`)
Memory diagnostics	`MEMORY DOCTOR` / `MEMORY STATS` / `MEMORY USAGE <key>`
Connections	`CLIENT LIST` / `CLIENT INFO`
RQE / Search	`FT.INFO <idx>` / `FT.PROFILE <idx> SEARCH QUERY "..."`

The two most useful for incident triage:

SLOWLOG GET to find queries that exceeded the slowlog-log-slower-than threshold (10ms by default). The output shows the exact command and duration in microseconds.
MEMORY DOCTOR for memory pressure — it returns a one-paragraph summary of what's unusual about memory usage right now.

for entry in redis.slowlog_get(10):
    print(f"{entry['duration']}μs  {entry['command']}")

See references/commands.md.

3. Redis Insight

For interactive use (running queries, browsing keys, profiling indexes), Redis Insight is the official GUI. It surfaces the same SLOWLOG / INFO / FT.PROFILE data visually and includes Redis Copilot for natural-language queries. Useful during development and incident response; not a replacement for exporting metrics to your monitoring system.

References

附带文件

.cursor-plugin/plugin.json

{
  "name": "redis-observability",
  "version": "1.0.0",
  "description": "Redis observability — key metrics to monitor (INFO), debugging commands (SLOWLOG, MEMORY DOCTOR, FT.PROFILE), Redis Insight.",
  "author": {
    "name": "Redis",
    "email": "support@redis.com"
  },
  "homepage": "https://redis.io",
  "repository": "https://github.com/redis/agent-skills",
  "license": "MIT",
  "keywords": ["redis", "observability", "monitoring", "metrics", "slowlog"]
}

references/commands.md

# Use Observability Commands for Debugging

Redis provides built-in commands for monitoring and debugging.

**Key commands:**

```
# Slow query log - find slow commands
SLOWLOG GET 10
SLOWLOG LEN
SLOWLOG RESET

# Server info - comprehensive stats
INFO all
INFO memory
INFO stats
INFO replication
INFO clients

# Memory analysis
MEMORY DOCTOR
MEMORY STATS
MEMORY USAGE mykey

# Client connections
CLIENT LIST
CLIENT INFO

# Index info (RQE)
FT.INFO idx:products
FT.PROFILE idx:products SEARCH QUERY "@name:laptop"
```

**Correct:** Check SLOWLOG regularly.

```python
# Get recent slow queries
slow_queries = redis.slowlog_get(10)
for query in slow_queries:
    print(f"Duration: {query['duration']}μs, Command: {query['command']}")
```

Reference: [Redis Monitoring](https://redis.io/docs/latest/operate/oss_and_stack/management/optimization/latency/)

references/metrics.md

# Monitor Key Redis Metrics

Track these metrics to catch issues before they impact users.

| Metric | What It Tells You | Alert When |
|--------|-------------------|------------|
| `used_memory` | Current memory usage | > 80% of maxmemory |
| `connected_clients` | Number of connections | Sudden spikes or drops |
| `blocked_clients` | Clients waiting on blocking ops | > 0 sustained |
| `instantaneous_ops_per_sec` | Current throughput | Significant drops |
| `keyspace_hits/misses` | Cache hit ratio | Hit ratio < 80% |
| `rejected_connections` | Connection limit issues | > 0 |
| `rdb_last_save_time` | Last persistence snapshot | Too old |

**Correct:** Export metrics to your monitoring system.

```python
# Get key metrics
info = redis.info()
print(f"Memory: {info['used_memory_human']}")
print(f"Connections: {info['connected_clients']}")
print(f"Ops/sec: {info['instantaneous_ops_per_sec']}")
print(f"Hit ratio: {info['keyspace_hits'] / (info['keyspace_hits'] + info['keyspace_misses']) * 100:.1f}%")
```

**Redis Insight:**
Use Redis Insight for visual monitoring, query profiling, and debugging. It includes Redis Copilot for natural language queries.

Reference: [Redis Insight](https://redis.io/insight/)