feat(alerting): Add group-specific WebHook URL for Google Chat

[appleboy]

Add group-specific webhook URL for Google Chat

alerting:
  googlechat: 
    webhook-url: "https://chat.googleapis.com/v1/spaces/*******/messages?key=**********&token=********"
    # You can also add group-specific to keys, which will 
    # override the to key above for the specified groups
    overrides:
      - group: "core"
        webhook-url: "https://chat.googleapis.com/v1/spaces/*******/messages?key=**********&token=********"

endpoints:
  - name: website
    url: "https://twin.sh/health"
    interval: 30s
    conditions:
      - "[STATUS] == 200"
      - "[BODY].status == UP"
      - "[RESPONSE_TIME] < 300"
    alerts:
      - type: googlechat
        enabled: true
        description: "healthcheck failed"
        send-on-resolved: true

  - name: back-end
    group: core
    url: "https://example.org/"
    interval: 5m
    conditions:
      - "[STATUS] == 200"
      - "[CERTIFICATE_EXPIRATION] > 48h"
    alerts:
      - type: googlechat
        enabled: true
        description: "healthcheck failed"
        send-on-resolved: true

ref: #96

Signed-off-by: Bo-Yi Wu appleboy.tw@gmail.com

[TwiN]

Will wait for #271 before looking into this, since there seems to be some overlapping suggestions.

[TwiN]

Any chance you could look into applying the same changes I requested in #271? 🙏

[appleboy]

@TwiN I will take it.

[appleboy]

@TwiN Done. Please help to review again.

[codecov-commenter]

Codecov Report

Merging #272 (d16a5dd) into master (5281f80) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #272      +/-   ##
==========================================
- Coverage   83.70%   83.68%   -0.03%     
==========================================
  Files          53       53              
  Lines        3462     3499      +37     
==========================================
+ Hits         2898     2928      +30     
- Misses        439      444       +5     
- Partials      125      127       +2     

Impacted Files	Coverage Δ
alerting/provider/googlechat/googlechat.go	94.11% <100.00%> (+0.93%)	⬆️
config/maintenance/maintenance.go	92.40% <0.00%> (-3.80%)	⬇️
config/ui/ui.go	63.88% <0.00%> (-2.78%)	⬇️
alerting/provider/discord/discord.go	91.78% <0.00%> (+1.95%)	⬆️

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[TwiN]

Released in v4.0.0