Send system alerts to Slack and the on-call phone

import time
from clickruntime import on_event, credentials, http, notify, state

ON_CALL = "447700900123"
WA = "https://graph.facebook.com/v20.0/your-phone-number-id/messages"

def wa_template(to, name, params):
    body = {"messaging_product": "whatsapp", "to": to, "type": "template", "template": {"name": name, "language": {"code": "en"},
            "components": [{"type": "body", "parameters": [{"type": "text", "text": str(p)} for p in params]}]}}
    return http.post(WA, headers={"Authorization": f"Bearer {credentials.secret('WHATSAPP_TOKEN')}"}, json=body).json()

@on_event
def handle(event):
    a = event.json or {}
    title = str(a.get("title") or a.get("message") or "Alert")[:150]
    severity = a.get("severity", "high")
    if time.time() - (state.get(f"last:{title}") or 0) < 1800:
        return {"skipped": "repeat"}
    notify.slack(f":rotating_light: [{severity}] {title}\n{a.get('details', '')}"[:3000], channel="#alerts")
    if severity in ("high", "critical"):
        wa_template(ON_CALL, "critical_alert", [title])
    state.set(f"last:{title}", time.time())
    return {"alerted": title}