Regenerate monitoring client

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/google-cloud-clients/google-cloud-monitoring/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:9aed6bbde54e26d2fcde7aa86d9f64c0278f741e58808c46573e488cbf6098f0
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/monitoring/artman_monitoring.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java.
synthtool > Running java formatter on 48 files
synthtool > Running java formatter on 5 files
synthtool > Running java formatter on 153 files
synthtool > Cleaned up 0 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[chingor13]

Combined into a single pull request #5850

[codecov]

Codecov Report

Merging #5834 into master will decrease coverage by 0.67%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #5834      +/-   ##
============================================
- Coverage     46.79%   46.12%   -0.68%     
+ Complexity    25648    24189    -1459     
============================================
  Files          2456     2456              
  Lines        267593   262236    -5357     
  Branches      30564    29602     -962     
============================================
- Hits         125228   120953    -4275     
+ Misses       133106   132172     -934     
+ Partials       9259     9111     -148

Impacted Files	Coverage Δ	Complexity Δ
.../monitoring/v3/stub/MetricServiceStubSettings.java	77.38% <ø> (-0.34%)	17 <0> (-1)
...toring/v3/stub/AlertPolicyServiceStubSettings.java	80.15% <ø> (-0.45%)	14 <0> (-1)
...3/stub/NotificationChannelServiceStubSettings.java	75.97% <ø> (-0.4%)	16 <0> (-1)
...loud/monitoring/v3/UptimeCheckServiceSettings.java	17.94% <ø> (ø)	2 <0> (ø)	⬇️
...ogle/cloud/monitoring/v3/GroupServiceSettings.java	17.94% <ø> (ø)	2 <0> (ø)	⬇️
...loud/monitoring/v3/AlertPolicyServiceSettings.java	18.91% <ø> (ø)	2 <0> (ø)	⬇️
...d/monitoring/v3/stub/GroupServiceStubSettings.java	75.48% <ø> (-0.47%)	15 <0> (-1)
...itoring/v3/NotificationChannelServiceSettings.java	14.58% <ø> (ø)	2 <0> (ø)	⬇️
...gle/cloud/monitoring/v3/MetricServiceSettings.java	15.9% <ø> (ø)	2 <0> (ø)	⬇️
...toring/v3/stub/UptimeCheckServiceStubSettings.java	74.37% <ø> (-0.48%)	15 <0> (-1)
... and 661 more

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