Feature/collection metric

[Shylock-Hg]

Sub job of #3322

Add collection metrics for rest API.

e.g.

shylock@localhost:~> curl http://localhost:6333/metrics
# HELP app_info information about qdrant server
# TYPE app_info counter
app_info{name="qdrant",version="1.9.0-dev"} 1
# HELP app_status_recovery_mode features enabled in qdrant server
# TYPE app_status_recovery_mode counter
app_status_recovery_mode 0
# HELP collections_total number of collections
# TYPE collections_total gauge
collections_total 1
# HELP collections_vector_total total number of vectors in all collections
# TYPE collections_vector_total gauge
collections_vector_total 0
# HELP cluster_enabled is cluster support enabled
# TYPE cluster_enabled counter
cluster_enabled 0
# HELP rest_responses_total total number of responses
# TYPE rest_responses_total counter
rest_responses_total{method="GET",endpoint="/collections/{name}/points",status="404"} 1
# HELP rest_responses_fail_total total number of failed responses
# TYPE rest_responses_fail_total counter
rest_responses_fail_total{method="GET",endpoint="/collections/{name}/points",status="404"} 0
# HELP rest_responses_total total number of responses
# TYPE rest_responses_total counter
rest_responses_total{collection="test_collection",method="GET",endpoint="/collections/{name}/points",status="404"} 1
# HELP rest_responses_fail_total total number of failed responses
# TYPE rest_responses_fail_total counter
rest_responses_fail_total{collection="test_collection",method="GET",endpoint="/collections/{name}/points",status="404"} 0

All Submissions:

• Contributions should target the dev branch. Did you create your branch from dev?
• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests?
2. Have you formatted your code locally using cargo +nightly fmt --all command prior to submission?
3. Have you checked your code using cargo clippy --all --all-features command?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

[Shylock-Hg]

@generall Could take a look ?

[Shylock-Hg]

@generall Hello?

[Shylock-Hg]

@generall Is it still available?