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chore: extend doc: adr, tutorials, operations, etc
2026-01-12 03:32:47 +00:00
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<h1 id="vapora-backup-strategy"><a class="header" href="#vapora-backup-strategy">VAPORA Backup Strategy</a></h1>
<p>Comprehensive backup and data protection strategy for VAPORA infrastructure.</p>
<hr />
<h2 id="overview"><a class="header" href="#overview">Overview</a></h2>
<p><strong>Purpose</strong>: Protect against data loss, corruption, and service interruptions</p>
<p><strong>Coverage</strong>:</p>
<ul>
<li>Database backups (SurrealDB)</li>
<li>Configuration backups (ConfigMaps, Secrets)</li>
<li>Application state</li>
<li>Infrastructure-as-Code</li>
<li>Container images</li>
</ul>
<p><strong>Success Metrics</strong>:</p>
<ul>
<li>RPO (Recovery Point Objective): 1 hour (lose at most 1 hour of data)</li>
<li>RTO (Recovery Time Objective): 4 hours (restore service within 4 hours)</li>
<li>Backup availability: 99.9% (backups always available when needed)</li>
<li>Backup validation: 100% (all backups tested monthly)</li>
</ul>
<hr />
<h2 id="backup-architecture"><a class="header" href="#backup-architecture">Backup Architecture</a></h2>
<h3 id="what-gets-backed-up"><a class="header" href="#what-gets-backed-up">What Gets Backed Up</a></h3>
<pre><code>VAPORA Backup Scope
Critical (Daily):
├── Database
│ ├── SurrealDB data
│ ├── User data
│ ├── Project/task data
│ └── Audit logs
├── Configuration
│ ├── ConfigMaps
│ ├── Secrets
│ └── Deployment manifests
└── Infrastructure Code
├── Provisioning/Nickel configs
├── Kubernetes manifests
└── Scripts
Important (Weekly):
├── Application logs
├── Metrics data
└── Documentation updates
Optional (As-needed):
├── Container images
├── Build artifacts
└── Development configurations
</code></pre>
<h3 id="backup-storage-strategy"><a class="header" href="#backup-storage-strategy">Backup Storage Strategy</a></h3>
<pre><code>PRIMARY BACKUP LOCATION
├── Storage: Cloud object storage (S3/GCS/Azure Blob)
├── Frequency: Hourly for database, daily for configs
├── Retention: 30 days rolling window
├── Encryption: AES-256 at rest
└── Redundancy: Geo-replicated to different region
SECONDARY BACKUP LOCATION (for critical data)
├── Storage: Different cloud provider or on-prem
├── Frequency: Daily
├── Retention: 90 days
├── Purpose: Protection against primary provider outage
└── Testing: Restore tested weekly
ARCHIVE LOCATION (compliance/long-term)
├── Storage: Cold storage (Glacier, Azure Archive)
├── Frequency: Monthly
├── Retention: 7 years (adjust per compliance needs)
├── Purpose: Compliance &amp; legal holds
└── Accessibility: ~4 hours to retrieve
</code></pre>
<hr />
<h2 id="database-backup-procedures"><a class="header" href="#database-backup-procedures">Database Backup Procedures</a></h2>
<h3 id="surrealdb-backup"><a class="header" href="#surrealdb-backup">SurrealDB Backup</a></h3>
<p><strong>Backup Method</strong>: Full database dump via SurrealDB export</p>
<pre><code class="language-bash"># Export full database
kubectl exec -n vapora surrealdb-pod -- \
surreal export --conn ws://localhost:8000 \
--user root \
--pass "$DB_PASSWORD" \
--output backup-$(date +%Y%m%d-%H%M%S).sql
# Expected size: 100MB-1GB (depending on data)
# Expected time: 5-15 minutes
</code></pre>
<p><strong>Automated Backup Setup</strong></p>
<pre><code class="language-bash"># Create backup script: provisioning/scripts/backup-database.nu
def backup_database [output_dir: string] {
let timestamp = (date now | format date %Y%m%d-%H%M%S)
let backup_file = $"($output_dir)/vapora-db-($timestamp).sql"
print $"Starting database backup to ($backup_file)..."
# Export database
kubectl exec -n vapora deployment/vapora-backend -- \
surreal export \
--conn ws://localhost:8000 \
--user root \
--pass $env.DB_PASSWORD \
--output $backup_file
# Compress
gzip $backup_file
# Upload to S3
aws s3 cp $"($backup_file).gz" \
s3://vapora-backups/database/$(date +%Y-%m-%d)/ \
--sse AES256
print $"Backup complete: ($backup_file).gz"
}
</code></pre>
<p><strong>Backup Schedule</strong></p>
<pre><code class="language-yaml"># Kubernetes CronJob for hourly backups
apiVersion: batch/v1
kind: CronJob
metadata:
name: database-backup
namespace: vapora
spec:
schedule: "0 * * * *" # Every hour
jobTemplate:
spec:
template:
spec:
containers:
- name: backup
image: vapora/backup-tools:latest
command:
- /scripts/backup-database.sh
env:
- name: DB_PASSWORD
valueFrom:
secretKeyRef:
name: db-credentials
key: password
- name: AWS_ACCESS_KEY_ID
valueFrom:
secretKeyRef:
name: aws-credentials
key: access-key
restartPolicy: OnFailure
</code></pre>
<h3 id="backup-retention-policy"><a class="header" href="#backup-retention-policy">Backup Retention Policy</a></h3>
<pre><code>Hourly backups (last 24 hours):
├── Keep: All hourly backups
├── Purpose: Granular recovery options
└── Storage: Standard (fast access)
Daily backups (last 30 days):
├── Keep: 1 per day at midnight UTC
├── Purpose: Daily recovery options
└── Storage: Standard (fast access)
Weekly backups (last 90 days):
├── Keep: 1 per Sunday at midnight UTC
├── Purpose: Medium-term recovery
└── Storage: Standard
Monthly backups (7 years):
├── Keep: 1 per month on 1st at midnight UTC
├── Purpose: Compliance &amp; long-term recovery
└── Storage: Archive (cold storage)
</code></pre>
<h3 id="backup-verification"><a class="header" href="#backup-verification">Backup Verification</a></h3>
<pre><code class="language-bash"># Daily backup verification
def verify_backup [backup_file: string] {
print $"Verifying backup: ($backup_file)"
# 1. Check file integrity
if (not (file exists $backup_file)) {
error make {msg: $"Backup file not found: ($backup_file)"}
}
# 2. Check file size (should be &gt; 1MB)
let size = (ls $backup_file | get 0.size)
if ($size &lt; 1000000) {
error make {msg: $"Backup file too small: ($size) bytes"}
}
# 3. Check file header (should contain SQL dump)
let header = (open -r $backup_file | first 10)
if (not ($header | str contains "SURREALDB")) {
error make {msg: "Invalid backup format"}
}
print "✓ Backup verified successfully"
}
# Monthly restore test
def test_restore [backup_file: string] {
print $"Testing restore from: ($backup_file)"
# 1. Create temporary test database
kubectl run -n vapora test-db --image=surrealdb/surrealdb:latest \
-- start file://test-data
# 2. Restore backup to test database
kubectl exec -n vapora test-db -- \
surreal import --conn ws://localhost:8000 \
--user root --pass "$DB_PASSWORD" \
--input $backup_file
# 3. Verify data integrity
kubectl exec -n vapora test-db -- \
surreal sql --conn ws://localhost:8000 \
--user root --pass "$DB_PASSWORD" \
"SELECT COUNT(*) FROM projects"
# 4. Compare record counts
# Should match production database
# 5. Cleanup test database
kubectl delete pod -n vapora test-db
print "✓ Restore test passed"
}
</code></pre>
<hr />
<h2 id="configuration-backup"><a class="header" href="#configuration-backup">Configuration Backup</a></h2>
<h3 id="configmap--secret-backups"><a class="header" href="#configmap--secret-backups">ConfigMap &amp; Secret Backups</a></h3>
<pre><code class="language-bash"># Backup all ConfigMaps
kubectl get configmap -n vapora -o yaml &gt; configmaps-backup-$(date +%Y%m%d).yaml
# Backup all Secrets (encrypted)
kubectl get secret -n vapora -o yaml | \
openssl enc -aes-256-cbc -salt -out secrets-backup-$(date +%Y%m%d).yaml.enc
# Upload to S3
aws s3 sync . s3://vapora-backups/k8s-configs/$(date +%Y-%m-%d)/ \
--exclude "*" --include "*.yaml" --include "*.yaml.enc" \
--sse AES256
</code></pre>
<p><strong>Automated Nushell Script</strong></p>
<pre><code class="language-nushell">def backup_k8s_configs [output_dir: string] {
let timestamp = (date now | format date %Y%m%d)
let config_dir = $"($output_dir)/k8s-configs-($timestamp)"
mkdir $config_dir
# Backup ConfigMaps
kubectl get configmap -n vapora -o yaml &gt; $"($config_dir)/configmaps.yaml"
# Backup Secrets (encrypted)
kubectl get secret -n vapora -o yaml | \
openssl enc -aes-256-cbc -salt -out $"($config_dir)/secrets.yaml.enc"
# Backup Deployments
kubectl get deployments -n vapora -o yaml &gt; $"($config_dir)/deployments.yaml"
# Backup Services
kubectl get services -n vapora -o yaml &gt; $"($config_dir)/services.yaml"
# Backup all to archive
tar -czf $"($config_dir).tar.gz" $config_dir
# Upload
aws s3 cp $"($config_dir).tar.gz" \
s3://vapora-backups/configs/ \
--sse AES256
print "✓ K8s configs backed up"
}
</code></pre>
<hr />
<h2 id="infrastructure-as-code-backups"><a class="header" href="#infrastructure-as-code-backups">Infrastructure-as-Code Backups</a></h2>
<h3 id="git-repository-backups"><a class="header" href="#git-repository-backups">Git Repository Backups</a></h3>
<p><strong>Primary</strong>: GitHub (with backup organization)</p>
<pre><code class="language-bash"># Mirror repository to backup location
git clone --mirror https://github.com/your-org/vapora.git \
vapora-mirror.git
# Push to backup location
cd vapora-mirror.git
git push --mirror https://backup-git-server/vapora-mirror.git
</code></pre>
<p><strong>Backup Schedule</strong></p>
<pre><code class="language-yaml"># Daily mirror push
*/6 * * * * /scripts/backup-git-repo.sh
</code></pre>
<h3 id="provisioning-code-backups"><a class="header" href="#provisioning-code-backups">Provisioning Code Backups</a></h3>
<pre><code class="language-bash"># Backup Nickel configs &amp; scripts
def backup_provisioning_code [output_dir: string] {
let timestamp = (date now | format date %Y%m%d)
# Create backup
tar -czf $"($output_dir)/provisioning-($timestamp).tar.gz" \
provisioning/schemas \
provisioning/scripts \
provisioning/templates
# Upload
aws s3 cp $"($output_dir)/provisioning-($timestamp).tar.gz" \
s3://vapora-backups/provisioning/ \
--sse AES256
}
</code></pre>
<hr />
<h2 id="application-state-backups"><a class="header" href="#application-state-backups">Application State Backups</a></h2>
<h3 id="persistent-volume-backups"><a class="header" href="#persistent-volume-backups">Persistent Volume Backups</a></h3>
<p>If using persistent volumes for data:</p>
<pre><code class="language-bash"># Backup PersistentVolumeClaims
def backup_pvcs [namespace: string] {
let pvcs = (kubectl get pvc -n $namespace -o json | from json).items
for pvc in $pvcs {
let pvc_name = $pvc.metadata.name
let volume_size = $pvc.spec.resources.requests.storage
print $"Backing up PVC: ($pvc_name) (($volume_size))"
# Create snapshot (cloud-specific)
aws ec2 create-snapshot \
--volume-id $pvc_name \
--description $"VAPORA backup $(date +%Y-%m-%d)"
}
}
</code></pre>
<h3 id="application-logs"><a class="header" href="#application-logs">Application Logs</a></h3>
<pre><code class="language-bash"># Export logs for archive
def backup_application_logs [output_dir: string] {
let timestamp = (date now | format date %Y%m%d)
# Export last 7 days of logs
kubectl logs deployment/vapora-backend -n vapora \
--since=168h &gt; $"($output_dir)/backend-logs-($timestamp).log"
kubectl logs deployment/vapora-agents -n vapora \
--since=168h &gt; $"($output_dir)/agents-logs-($timestamp).log"
# Compress and upload
gzip $"($output_dir)/*.log"
aws s3 sync $output_dir s3://vapora-backups/logs/ \
--exclude "*" --include "*.log.gz" \
--sse AES256
}
</code></pre>
<hr />
<h2 id="container-image-backups"><a class="header" href="#container-image-backups">Container Image Backups</a></h2>
<h3 id="docker-image-registry"><a class="header" href="#docker-image-registry">Docker Image Registry</a></h3>
<pre><code class="language-bash"># Tag images for backup
docker tag vapora/backend:latest vapora/backend:backup-$(date +%Y%m%d)
docker tag vapora/agents:latest vapora/agents:backup-$(date +%Y%m%d)
docker tag vapora/llm-router:latest vapora/llm-router:backup-$(date +%Y%m%d)
# Push to backup registry
docker push backup-registry/vapora/backend:backup-$(date +%Y%m%d)
docker push backup-registry/vapora/agents:backup-$(date +%Y%m%d)
docker push backup-registry/vapora/llm-router:backup-$(date +%Y%m%d)
# Retention: Keep last 30 days of images
</code></pre>
<hr />
<h2 id="backup-monitoring"><a class="header" href="#backup-monitoring">Backup Monitoring</a></h2>
<h3 id="backup-health-checks"><a class="header" href="#backup-health-checks">Backup Health Checks</a></h3>
<pre><code class="language-bash"># Daily backup status check
def check_backup_status [] {
print "=== Backup Status Report ==="
# 1. Check latest database backup
let latest_db = (aws s3 ls s3://vapora-backups/database/ \
--recursive | tail -1)
let db_age = (date now) - ($latest_db | from json | get LastModified)
if ($db_age &gt; 2h) {
print "⚠️ Database backup stale (&gt; 2 hours old)"
} else {
print "✓ Database backup current"
}
# 2. Check config backup
let config_count = (aws s3 ls s3://vapora-backups/configs/ | wc -l)
if ($config_count &gt; 0) {
print "✓ Config backups present"
} else {
print "❌ No config backups found"
}
# 3. Check storage usage
let storage_used = (aws s3 ls s3://vapora-backups/ --recursive --summarize | grep "Total Size")
print $"Storage used: ($storage_used)"
# 4. Check backup encryption
let objects = (aws s3api list-objects-v2 --bucket vapora-backups --query 'Contents[*]')
# All should have ServerSideEncryption: AES256
print "=== End Report ==="
}
</code></pre>
<h3 id="backup-alerts"><a class="header" href="#backup-alerts">Backup Alerts</a></h3>
<p>Configure alerts for:</p>
<pre><code class="language-yaml">Backup Failures:
- Threshold: Backup not completed in 2 hours
- Action: Alert operations team
- Severity: High
Backup Staleness:
- Threshold: Latest backup &gt; 24 hours old
- Action: Alert operations team
- Severity: High
Storage Capacity:
- Threshold: Backup storage &gt; 80% full
- Action: Alert &amp; plan cleanup
- Severity: Medium
Restore Test Failures:
- Threshold: Monthly restore test fails
- Action: Alert &amp; investigate
- Severity: Critical
</code></pre>
<hr />
<h2 id="backup-testing--validation"><a class="header" href="#backup-testing--validation">Backup Testing &amp; Validation</a></h2>
<h3 id="monthly-restore-test"><a class="header" href="#monthly-restore-test">Monthly Restore Test</a></h3>
<p><strong>Schedule</strong>: First Sunday of each month at 02:00 UTC</p>
<pre><code class="language-bash">def monthly_restore_test [] {
print "Starting monthly restore test..."
# 1. Select random recent backup
let backup_date = (date now | date delta -d 7d | format date %Y-%m-%d)
# 2. Download backup
aws s3 cp s3://vapora-backups/database/$backup_date/ \
./test-backups/ \
--recursive
# 3. Restore to test environment
# (See Database Recovery Procedures)
# 4. Verify data integrity
# - Count records match
# - No data corruption
# - All tables present
# 5. Verify application works
# - Can query database
# - Can perform basic operations
# 6. Document results
# - Success/failure
# - Any issues found
# - Time taken
print "✓ Restore test completed"
}
</code></pre>
<h3 id="backup-audit-report"><a class="header" href="#backup-audit-report">Backup Audit Report</a></h3>
<p><strong>Quarterly</strong>: Generate backup audit report</p>
<pre><code class="language-bash">def quarterly_backup_audit [] {
print "=== Quarterly Backup Audit Report ==="
print $"Report Date: (date now | format date %Y-%m-%d)"
print ""
print "1. Backup Coverage"
print " Database: Daily ✓"
print " Configs: Daily ✓"
print " IaC: Daily ✓"
print ""
print "2. Restore Tests (Last Quarter)"
print " Tests Performed: 3"
print " Tests Passed: 3"
print " Average Restore Time: 2.5 hours"
print ""
print "3. Storage Usage"
# Calculate storage per category
print "4. Backup Age Distribution"
# Show age distribution of backups
print "5. Incidents &amp; Issues"
# Any backup-related incidents
print "6. Recommendations"
# Any needed improvements
}
</code></pre>
<hr />
<h2 id="backup-security"><a class="header" href="#backup-security">Backup Security</a></h2>
<h3 id="encryption"><a class="header" href="#encryption">Encryption</a></h3>
<ul>
<li>✅ All backups encrypted at rest (AES-256)</li>
<li>✅ All backups encrypted in transit (HTTPS/TLS)</li>
<li>✅ Encryption keys managed by cloud provider or KMS</li>
<li>✅ Separate keys for database and config backups</li>
</ul>
<h3 id="access-control"><a class="header" href="#access-control">Access Control</a></h3>
<pre><code>Backup Access Policy:
Read Access:
- Operations team
- Disaster recovery team
- Compliance/audit team
Write Access:
- Automated backup system only
- Require 2FA for manual backups
Delete/Modify Access:
- Require 2 approvals
- Audit logging enabled
- 24-hour delay before deletion
</code></pre>
<h3 id="audit-logging"><a class="header" href="#audit-logging">Audit Logging</a></h3>
<pre><code class="language-bash"># All backup operations logged
- Backup creation: When, size, hash
- Backup retrieval: Who, when, what
- Restore operations: When, who, from where
- Backup deletion: When, who, reason
# Logs stored separately and immutable
# Example: CloudTrail, S3 access logs, custom logging
</code></pre>
<hr />
<h2 id="backup-disaster-scenarios"><a class="header" href="#backup-disaster-scenarios">Backup Disaster Scenarios</a></h2>
<h3 id="scenario-1-single-database-backup-fails"><a class="header" href="#scenario-1-single-database-backup-fails">Scenario 1: Single Database Backup Fails</a></h3>
<p><strong>Impact</strong>: 1-hour data loss risk</p>
<p><strong>Prevention</strong>:</p>
<ul>
<li>Backup redundancy (multiple copies)</li>
<li>Multiple backup methods</li>
<li>Backup validation after each backup</li>
</ul>
<p><strong>Recovery</strong>:</p>
<ul>
<li>Use previous hour's backup</li>
<li>Restore to test environment first</li>
<li>Validate data integrity</li>
<li>Restore to production if good</li>
</ul>
<h3 id="scenario-2-backup-storage-compromised"><a class="header" href="#scenario-2-backup-storage-compromised">Scenario 2: Backup Storage Compromised</a></h3>
<p><strong>Impact</strong>: Data loss + security breach</p>
<p><strong>Prevention</strong>:</p>
<ul>
<li>Encryption with separate keys</li>
<li>Geographic redundancy</li>
<li>Backup verification signing</li>
<li>Access control restrictions</li>
</ul>
<p><strong>Recovery</strong>:</p>
<ul>
<li>Activate secondary backup location</li>
<li>Restore from archive backups</li>
<li>Full security audit</li>
</ul>
<h3 id="scenario-3-ransomware-infection"><a class="header" href="#scenario-3-ransomware-infection">Scenario 3: Ransomware Infection</a></h3>
<p><strong>Impact</strong>: All recent backups encrypted</p>
<p><strong>Prevention</strong>:</p>
<ul>
<li>Immutable backups (WORM)</li>
<li>Air-gapped backups (offline)</li>
<li>Archive-only old backups</li>
<li>Regular backup verification</li>
</ul>
<p><strong>Recovery</strong>:</p>
<ul>
<li>Use air-gapped backup</li>
<li>Restore to clean environment</li>
<li>Full security remediation</li>
</ul>
<h3 id="scenario-4-accidental-data-deletion"><a class="header" href="#scenario-4-accidental-data-deletion">Scenario 4: Accidental Data Deletion</a></h3>
<p><strong>Impact</strong>: Data loss from point of deletion</p>
<p><strong>Prevention</strong>:</p>
<ul>
<li>Frequent backups (hourly)</li>
<li>Soft deletes in application</li>
<li>Audit logging</li>
</ul>
<p><strong>Recovery</strong>:</p>
<ul>
<li>Restore from backup before deletion time</li>
<li>Point-in-time recovery if available</li>
</ul>
<hr />
<h2 id="backup-checklists"><a class="header" href="#backup-checklists">Backup Checklists</a></h2>
<h3 id="daily"><a class="header" href="#daily">Daily</a></h3>
<ul>
<li><input disabled="" type="checkbox"/>
Database backup completed</li>
<li><input disabled="" type="checkbox"/>
Backup size normal (not 0 bytes)</li>
<li><input disabled="" type="checkbox"/>
No backup errors in logs</li>
<li><input disabled="" type="checkbox"/>
Upload to S3 succeeded</li>
<li><input disabled="" type="checkbox"/>
Previous backup still available</li>
</ul>
<h3 id="weekly"><a class="header" href="#weekly">Weekly</a></h3>
<ul>
<li><input disabled="" type="checkbox"/>
Database backup retention verified</li>
<li><input disabled="" type="checkbox"/>
Config backup completed</li>
<li><input disabled="" type="checkbox"/>
Infrastructure code backed up</li>
<li><input disabled="" type="checkbox"/>
Backup storage space adequate</li>
<li><input disabled="" type="checkbox"/>
Encryption keys accessible</li>
</ul>
<h3 id="monthly"><a class="header" href="#monthly">Monthly</a></h3>
<ul>
<li><input disabled="" type="checkbox"/>
Restore test scheduled</li>
<li><input disabled="" type="checkbox"/>
Backup audit report generated</li>
<li><input disabled="" type="checkbox"/>
Backup verification successful</li>
<li><input disabled="" type="checkbox"/>
Archive backups created</li>
<li><input disabled="" type="checkbox"/>
Old backups properly retained</li>
</ul>
<h3 id="quarterly"><a class="header" href="#quarterly">Quarterly</a></h3>
<ul>
<li><input disabled="" type="checkbox"/>
Full audit report completed</li>
<li><input disabled="" type="checkbox"/>
Backup strategy reviewed</li>
<li><input disabled="" type="checkbox"/>
Team trained on procedures</li>
<li><input disabled="" type="checkbox"/>
RTO/RPO targets met</li>
<li><input disabled="" type="checkbox"/>
Recommendations implemented</li>
</ul>
<hr />
<h2 id="summary"><a class="header" href="#summary">Summary</a></h2>
<p><strong>Backup Strategy at a Glance</strong>:</p>
<div class="table-wrapper"><table><thead><tr><th>Item</th><th>Frequency</th><th>Retention</th><th>Storage</th><th>Encryption</th></tr></thead><tbody>
<tr><td><strong>Database</strong></td><td>Hourly</td><td>30 days</td><td>S3</td><td>AES-256</td></tr>
<tr><td><strong>Config</strong></td><td>Daily</td><td>90 days</td><td>S3</td><td>AES-256</td></tr>
<tr><td><strong>IaC</strong></td><td>Daily</td><td>30 days</td><td>Git + S3</td><td>AES-256</td></tr>
<tr><td><strong>Images</strong></td><td>Daily</td><td>30 days</td><td>Registry</td><td>Built-in</td></tr>
<tr><td><strong>Archive</strong></td><td>Monthly</td><td>7 years</td><td>Glacier</td><td>AES-256</td></tr>
</tbody></table>
</div>
<p><strong>Key Metrics</strong>:</p>
<ul>
<li>RPO: 1 hour (lose at most 1 hour of data)</li>
<li>RTO: 4 hours (restore within 4 hours)</li>
<li>Availability: 99.9% (backups available when needed)</li>
<li>Validation: 100% (all backups tested monthly)</li>
</ul>
<p><strong>Success Criteria</strong>:</p>
<ul>
<li>✅ Daily backup completion</li>
<li>✅ Backup validation passes</li>
<li>✅ Monthly restore test successful</li>
<li>✅ No security incidents</li>
<li>✅ Compliance requirements met</li>
</ul>
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