* [**Breaking Change**]: Remove prometheus-fetcher plugin, please use OpenTelemetry to scrape Prometheus metrics and
set up SkyWalking OpenTelemetry receiver instead.
* BugFix: histogram metrics sent to MAL should be treated as OpenTelemetry style, not Prometheus style:
```
(-infinity, explicit_bounds[i]] for i == 0
(explicit_bounds[i-1], explicit_bounds[i]] for 0 < i < size(explicit_bounds)
(explicit_bounds[i-1], +infinity) for i == size(explicit_bounds)
```
**WARNING**, since Apr 21, 2021, **Grafana** project has been relicensed to **AGPL-v3**, no as Apache 2.0 anymore. Check the LICENSE details.
The following Prometheus + Grafana solution is optional, not a recommendation.
Here are the list of changes we made in this pull request. Top 3 are the principle changes, others are following these principles.
1. New agent and mesh report protocol.
2. New agent header protocol.
3. Service register, instance register and network address register have been removed permanently.
4. Service traffic, instance traffic and network alias metrics are added to replace the service, instance and network address inventory.
5. Register process has been removed.
6. Metrics stream process supports insert only mode, especially for traffic entities.
7. Metrics stream process supports no-downsampling mode for traffic entities and network alias.
8. Remove all register mechanism and cache in the java agent.
9. Remove MONTH step in GraphQL query.
10. Update UI to remove MONTH step query, the max query range is 60 days now.
11. Simplify the TTL to metrics and record. And the unit has been formatted in Day unit. No specific TTL for ElasticSearch storage.
12. Buffer mechanism of trace receiver and mesh receiver has been removed due to no register.
13. New service id, instance id and endpoint id rules, including service relation, instance relation and endpoint relation id rules.
14. Java agent support `keep tracing` mode, meaning, agent generating tracing context even the backend is unconnected/unavailable.
15. Plugin test tool up to date, in order to support new protocol.
16. Plugin tests expected data files updated.
17. E2E tests updated.
18. Telemetry of Grafana config has been merged into one.
19. Documentation updates.
20. [TBD] InfluxDB storage implementation is not available, need @dmsolr to fix later, in order to reduce the master change block by this PR.
### Motivation
Ease the efforts of modifying configurations in automatic workflow and scripts, like Docker and helm chart.
### Modification
Add a `selector` property into `application.yml` to enable switching configuration simply by environment variables or system properties, and filter the unselected options, leaving only selected one.
### Result
- We can switch a configuration by environment variables or system property
- Closes#4511
* Change a label name for sw instance to avoid confict.
* Fix a wrong metric name.
* Fix too many counter instances.
* Set uptime to second.
* Fix format.
* Fix format
* Remove two unnecessary counter.
* Provide grafana dashboard settings and remove unnecessary metric.
* Provide a simple UI brief doc. Fix#2137
* Finish the basic codes of telemetry.
* Add many telemetry in oap.
* Fix a test case.
* Finish all telemetry metric.
* Fix format.
* Make telemetry works.
* Support JVM metrics.
* Add doc for telemetry.
* Fix typo.
* Fix#2135
kezhenxu94
吴晟 Wu Sheng
Superskyyy
Wan Kai
Wing
Ax1an
Gao Hongtao
彭勇升 pengys