Platxa Monitoring

Guide for observability in the Platxa platform using Prometheus metrics and Loki logs.

Overview

This skill covers the complete observability stack:

Component	Purpose	Access
Prometheus	Metrics collection and alerting	Port 9090
Loki	Log aggregation and querying	Port 3100
Grafana	Visualization dashboards	Port 3000
Alertmanager	Alert routing and notification	Port 9093
Fluent Bit	Log collection from pods	DaemonSet

Prerequisites

Verify monitoring stack is running:

kubectl get pods -n monitoring
# prometheus-*, loki-*, grafana-*, fluent-bit-*

# Access Grafana locally
kubectl port-forward svc/grafana 3000:80 -n monitoring

Prometheus Metrics

Common PromQL Queries

Instance Resource Metrics

# Memory usage (bytes)
container_memory_working_set_bytes{
  namespace="instance-{name}",
  container="odoo"
}

# CPU usage (millicores)
sum(rate(container_cpu_usage_seconds_total{
  namespace="instance-{name}",
  container="odoo"
}[5m])) * 1000

# Storage usage (ratio)
kubelet_volume_stats_used_bytes{namespace="instance-{name}"}
/
kubelet_volume_stats_capacity_bytes{namespace="instance-{name}"}

Waking Service Metrics

# Instance state distribution
waking_instances_by_state{state="running"}
waking_instances_by_state{state="sleeping"}
waking_instances_by_state{state="waking"}
waking_instances_by_state{state="error"}

# Total tracked instances
waking_instances_total

PostgreSQL Metrics

# Database size
pg_database_size{datname=~"instance_.*"}

# Active connections per database
sum by (datname) (pg_stat_activity_count{state="active"})

# Slow queries (>30s)
pg_slow_queries_count

Recording Rules

Pre-computed metrics for dashboard efficiency:

Recording Rule	Description
instance:memory_usage:ratio	Memory usage percentage
instance:cpu_usage:millicores	CPU in millicores
instance:storage_usage:ratio	Storage percentage
instance:restarts:1h	Restart count (1 hour)
postgresql:connections:by_database	Connections per DB

ServiceMonitors

Automatic scrape targets via Prometheus Operator:

Target	Namespace	Port	Interval
postgres-exporter	postgres-system	9187	30s
traefik	traefik-system	8082	30s
waking-service	traefik-system	9100	30s
loki	monitoring	3100	30s
cert-manager	cert-manager	9402	60s

Loki Logs

LogQL Query Patterns

Basic Label Filtering

# All logs from an instance
{namespace="instance-abc123xy"}

# Specific container
{namespace="instance-abc123xy", container="odoo"}

# Multiple namespaces (regex)
{namespace=~"instance-.*"}

Pattern Matching

# Contains error (case insensitive)
{namespace=~"instance-.*"} |~ "(?i)error"

# Exact match
{namespace=~"instance-.*"} |= "FATAL"

# Exclude pattern
{namespace=~"instance-.*"} != "healthcheck"

# Regex pattern
{namespace=~"instance-.*"} |~ "connection refused|timeout"

Aggregations

# Error count over time
count_over_time({namespace="instance-abc123xy"} |~ "ERROR" [5m])

# Error rate per minute
rate({namespace=~"instance-.*"} |~ "ERROR" [1m])

# Top namespaces by log volume
topk(10, sum by (namespace) (rate({namespace=~"instance-.*"}[5m])))

Log Labels

Fluent Bit enriches logs with Kubernetes metadata:

Label	Source	Example
namespace	Pod namespace	instance-abc123xy
container	Container name	odoo
pod	Pod name	odoo-abc123xy-7f8b9c
app	Pod label	odoo
job	Static label	fluentbit

Multiline Log Handling

Python stack traces are automatically combined:

# Fluent Bit parser detects:
# - "Traceback (most recent call last):"
# - Indented continuation lines
# - "Error:", "Exception:", "Warning:"

Alerting

Alert Categories

Infrastructure Alerts

Alert	Condition	Severity
PostgreSQLDown	Target unreachable	critical
TraefikDown	Target unreachable	critical
WakingServiceDown	Target unreachable	critical
CertificateExpiringSoon	<14 days	warning
CertificateExpiringCritical	<3 days	critical

Instance Alerts

Alert	Condition	Severity
OdooStorageHigh	>90% used	warning
OdooStorageCritical	>95% used	critical
OdooHighMemory	>85% used	warning
OdooOOMKilled	Container killed	critical
OdooPodRestartLoop	>3 restarts/hour	warning
OdooWakeFailed	Scale-up failed	critical

Database Alerts

Alert	Condition	Severity
PostgreSQLHighConnections	>20 active per DB	warning
PostgreSQLTotalConnectionsCritical	>150 total	critical
PostgreSQLSlowQueries	>3 queries >30s	warning

Log-Based Alerts (Loki)

Alert	LogQL Pattern	Severity
OdooDBConnectionError	DB connection errors	critical
OdooHighErrorRate	>50 errors in 5m	warning

Alertmanager Routing

Routes:
  critical → platform-odoo (webhook, 10s group wait)
  warning  → platform-odoo (30s group wait)
  null     → silence (Watchdog, informational)

Webhook: Bearer token auth to Odoo platform
Grouping: By namespace and alertname

Workflow

Investigating Issues

Step 1: Identify Issue Type

Symptom	Primary Tool	Secondary
Slow response	Prometheus	Loki
Crashes/restarts	Loki	Prometheus
Out of memory	Prometheus	Loki
Connection errors	Loki	Prometheus
High resource usage	Prometheus	-

Step 2: Scope to Target

# Find instance namespace
kubectl get ns -l platxa.io/tier=instance | grep {name}

# Identify components
kubectl get pods -n instance-{name}

Step 3: Query Data

Prometheus (via Grafana or API):

# API query
curl -G 'http://localhost:9090/api/v1/query' \
  --data-urlencode 'query=instance:memory_usage:ratio{namespace="instance-abc123xy"}'

Loki (via Grafana or API):

# API query
curl -G 'http://localhost:3100/loki/api/v1/query' \
  --data-urlencode 'query={namespace="instance-abc123xy"} |~ "ERROR"'

Step 4: Correlate

• Match metric spikes with log timestamps
• Check alert history in Alertmanager
• Review recent events: kubectl get events -n instance-{name}

Step 5: Recommend Actions

• Use platxa-k8s-ops for operational commands
• Suggest resource adjustments
• Link to relevant troubleshooting guides

Examples

Example 1: Memory Investigation

User: "Instance abc123xy is running slow"

Response:

Check memory usage:

instance:memory_usage:ratio{namespace="instance-abc123xy"}
# Result: 0.92 (92% of limit)

Check for OOM events:

{namespace="instance-abc123xy"} |~ "OOM|killed|memory"

Recent restarts:

instance:restarts:1h{namespace="instance-abc123xy"}
# Result: 2 restarts

Finding: Memory pressure causing slowdown. Recommend increasing memory limit or reducing Odoo workers.

Example 2: Error Log Analysis

User: "Users report 500 errors on demo instance"

Response:

Search recent errors:

{namespace="instance-demo", container="odoo"}
  |~ "ERROR|Exception|Traceback"
  | json
  | line_format "{{.message}}"

Count errors by type:

sum by (level) (
  count_over_time({namespace="instance-demo"} |~ "ERROR|WARNING" [1h])
)

Check database connectivity:

{namespace="instance-demo"} |~ "could not connect|connection refused"

Finding: Database connection errors detected. Check PostgreSQL status with platxa-k8s-ops.

Example 3: Alert Investigation

User: "Got alert for OdooStorageCritical"

Response:

Check current storage usage:

instance:storage_usage:ratio{namespace=~"instance-.*"} > 0.90

Identify which PVC is full:

kubelet_volume_stats_used_bytes{namespace="instance-{name}"}
/
kubelet_volume_stats_capacity_bytes{namespace="instance-{name}"}

Results:

• odoo-{name}-addons: 45% used
• odoo-{name}-filestore: 97% used (CRITICAL)

Finding: Filestore PVC near capacity. Options:

1. Clean up old attachments
2. Expand PVC (if storage class supports)
3. Upgrade instance tier for larger storage

Example 4: Cold Start Performance

User: "Instances taking too long to wake"

Response:

Check waking service metrics:

# Current instance states
waking_instances_by_state

# Cold start timing (if exposed)
histogram_quantile(0.95, waking_cold_start_duration_bucket)

Check waking service logs:

{namespace="traefik-system", container="waking-service"}
  |~ "cold start|wake|scale"
  | json

Common causes:

• Large filestore extraction time
• Resource scheduling delays
• Init container timeouts

Grafana Dashboards

Pre-built dashboards available:

Dashboard	Purpose
Cluster Overview	Node and resource summary
Instances Overview	All instances at a glance
Instance Detail	Single instance deep dive
Postgres System	Database metrics
Edge Overview	Traefik and ingress
Scale-to-Zero	Wake/sleep patterns
Monitoring Health	Stack self-monitoring
Instance Status	Embeddable status widget

Access: Grafana → Dashboards → Browse

Troubleshooting

No Metrics Data

Symptom	Cause	Fix
Target down	Pod not running	Check pod status
No ServiceMonitor	Missing CRD	Apply ServiceMonitor
Wrong labels	Selector mismatch	Check release: prometheus label

No Logs in Loki

Symptom	Cause	Fix
Empty results	Wrong namespace	Verify label values
Missing logs	Fluent Bit down	Check DaemonSet
Delayed logs	Ingestion backlog	Check Loki metrics

Alerts Not Firing

Symptom	Cause	Fix
No alerts	Rule not loaded	Check PrometheusRule CRD
Not routing	Wrong labels	Verify severity label
Not received	Webhook error	Check Alertmanager logs

Output Checklist

After monitoring investigation:

• Relevant PromQL/LogQL query constructed
• Time range appropriate for issue
• Results interpreted correctly
• Metrics and logs correlated
• Root cause identified or narrowed
• Actionable recommendations provided
• Follow-up monitoring suggested

Related Resources

• PromQL Queries: See references/promql-queries.md
• LogQL Queries: See references/logql-queries.md
• Alert Rules: See references/alert-rules.md
• K8s Operations: Use platxa-k8s-ops skill