!Publish

Topic Frequencies

Computes frequencies of events per topic on a sliding interval.

This node is inspired by node-red-contrib-metric-per-topic

Documentation

Key features:

- Passthrough node, capturing metrics and let original message pass through
- Interval is sliding time window, allowing to report anytime and always have full interval data metrics
- Ability to specify topic key and value key measured, as JSON dot path (e.g. payload.uniqueid)
- Ability to specify report scheduler, distinct from interval used to measure frequencies
- Ability to control few operations, like reset counters, which can be triggered by Input node

!Example Flow

See documentation

Sample output:

``javascript
{
"topics": {
"toto": {
"sum": 450,
"avg": 6.081081081081081,
"min": 5,
"max": 15,
"elements": 74
},
"titi": {
"sum": 40,
"avg": 10,
"min": 10,
"max": 10,
"elements": 4
},
"": {
"sum": 490,
"avg": 6.282051282051282,
"min": 5,
"max": 15,
"elements": 78
}
},
"cycles": 2476,
"interval": 1,
"units": "minutes",
"topicKey": "payload.uniqueid",
"valueKey": "payload.temp",
"_msgid": "b1bb6c79.43cb4"
}
``