A tiny function for fetching a web-page, applying an xpath expression and then returning the count of nodes as influx line-protocol.

For use with the Telegraf exec plugin.

Usage:

The function requires three arguments:

• URL
• xpath expressino
• tagset (influx measurment and tag pairs)

$ xpath "https://www.example.com" "//button[contains(text(), 'In stock')]" "xpath,retailer=company"