Fix/optimization

[bakhterets]

Added:
Caching (RedisCache or SimpleCache)

The follow routes are now cached:
 "/" "/index"
 "/incidents/<incident_id>"
 "/history"
 "/availability"

Debugging expanded:

  If the RedisCache is used, then the connection to the 
  redis server is checked before creating an app instance,
  if the check fails, then the app will use SimpleDimple

Benchmark test:

$ flask --debug run --host=0.0.0.0
$ ab -n 3000 -c 100 http://127.0.0.0:5000/

Benchmarking 127.0.0.0 (be patient)
Completed 300 requests
Completed 600 requests
Completed 900 requests
Completed 1200 requests
Completed 1500 requests
Completed 1800 requests
Completed 2100 requests
Completed 2400 requests
Completed 2700 requests
Completed 3000 requests
Finished 3000 requests

Server Software:        Werkzeug/3.0.1
Server Hostname:        127.0.0.0
Server Port:            5000

Document Path:          /
Document Length:        101946 bytes

Concurrency Level:      100
Time taken for tests:   4.010 seconds
Complete requests:      3000
Failed requests:        0
Total transferred:      306369000 bytes
HTML transferred:       305838000 bytes
Requests per second:    748.07 [#/sec] (mean)
Time per request:       133.678 [ms] (mean)
Time per request:       1.337 [ms] (mean, across all concurrent requests)
Transfer rate:          74604.17 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.5      0       4
Processing:    24  127  12.5    126     158
Waiting:        9  115  12.5    114     146
Total:         28  127  12.1    126     158

Percentage of the requests served within a certain time (ms)
  50%    126
  66%    132
  75%    135
  80%    136
  90%    139
  95%    141
  98%    143
  99%    144
 100%    158 (longest request)

[vladimirhasko]

can you move this condition above the method definition (def check_redis_connection...)?
this doesn't look good to be present between 2 method definitions

[otc-zuul]

Build succeeded.
https://zuul.otc-service.com/t/eco/buildset/37729ab116924b8e8d9360aec3114258

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