[promtail] log: simplify log, only print hash

[liguozhong]

What this PR does / why we need it:
When promtail reload config.yaml, simplify log print, only print hash.

Hash function Use the same hash function as prometheus.
/github.com/prometheus/prometheus/model/labels/labels.go

import  "github.com/cespare/xxhash/v2"

func (ls Labels) HashWithoutLabels(b []byte, names ...string) (uint64, []byte) {
	...
	return xxhash.Sum64(b), b
}

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
level=info ts=2022-10-12T14:40:05.323235834Z caller=promtail.go:122 msg="Reloading configuration file" newConf="server:\n http_listen_network: tcp\n http_listen_address: \"\"\n http_listen_port: 9082\n http_listen_conn_limit: 0\n grpc_listen_network: tcp\n grpc_listen_address: \"\"\n grpc_listen_port: 0\n grpc_listen_conn_limit: 0\n tls_cipher_suites: \"\"\n tls_min_version: \"\"\n http_tls_config:\n cert_file: \"\"\n key_file: \"\"\n client_auth_type: \"\"\n client_ca_file: \"\"\n grpc_tls_config:\n cert_file: \"\"\n key_file: \"\"\n client_auth_type: \"\"\n client_ca_file: \"\"\n register_instrumentation: true\n graceful_shutdown_timeout: 30s\n http_server_read_timeout: 30s\n http_server_write_timeout: 30s\n http_server_idle_timeout: 2m0s\n grpc_server_max_recv_msg_size: 4194304\n grpc_server_max_send_msg_size: 4194304\n grpc_server_max_concurrent_streams: 100\n grpc_server_max_connection_idle: 2562047h47m16.854775807s\n grpc_server_max_connection_age: 2562047h47m16.854775807s\n grpc_server_max_connection_age_grace: 2562047h47m16.854775807s\n grpc_server_keepalive_time: 2h0m0s\n grpc_server_keepalive_timeout: 20s\n grpc_server_min_time_between_pings: 5m0s\n grpc_server_ping_without_stream_allowed: false\n log_format: logfmt\n log_level: info\n log_source_ips_enabled: false\n log_source_ips_header: \"\"\n log_source_ips_regex: \"\"\n log_request_at_info_level_enabled: false\n http_path_prefix: \"\"\n external_url: \"\"\n health_check_target: null\n disable: false\n enable_runtime_reload: false\nclient:\n url: \"\"\n batchwait: 1s\n batchsize: 1048576\n follow_redirects: false\n enable_http2: false\n backoff_config:\n min_period: 500ms\n max_period: 5m0s\n max_retries: 10\n timeout: 10s\n tenant_id: \"\"\n stream_lag_labels: \"\"\nclients:\n- url: http://localhost:3100/loki/api/v1/push\n batchwait: 1s\n batchsize: 1048576\n follow_redirects: false\n enable_http2: false\n backoff_config:\n min_period: 100ms\n max_period: 10s\n max_retries: 1000\n timeout: 10s\n tenant_id: docker\n stream_lag_labels: \"\"\npositions:\n sync_period: 10s\n filename: /tmp/positions.yaml\n ignore_invalid_yaml: false\nscrape_configs:\n- job_name: generated-logs\n pipeline_stages:\n - json:\n expressions:\n datetime: datetime\n http_method: method\n http_status: status\n - labels:\n ʊmlaʊt: hi\n static_configs:\n - targets:\n - localhost\n labels:\n __path__: /tmp/random\n job: generated-logs\ntarget_config:\n sync_period: 10s\n stdin: false\nlimits_config:\n readline_rate: 10000\n readline_burst: 10000\n readline_rate_drop: true\n max_streams: 0\n"

Checklist

• Reviewed the CONTRIBUTING.md guide
• Documentation added
• Tests updated
• CHANGELOG.md updated
• Changes that require user attention or interaction to upgrade are documented in docs/sources/upgrading/_index.md

[grafanabot]

./tools/diff_coverage.sh ../loki-main/test_results.txt test_results.txt ingester,distributor,querier,querier/queryrange,iter,storage,chunkenc,logql,loki

Change in test coverage per package. Green indicates 0 or positive change, red indicates that test coverage for a package fell.

+           ingester	0%
+        distributor	0%
+            querier	0%
+ querier/queryrange	0%
+               iter	0%
+            storage	0%
+           chunkenc	0%
+              logql	0%
+               loki	0%

[dannykopping]

Why did you use xxhash here? Wouldn't md5 be easier for a user to check against?

[liguozhong]

👌,you are right

[kavirajk]

Actually good idea. thanks @liguozhong.

Even if we want the actual configs values to check or anything we can always get it via /config.

Happy to merge if other maintainers have no issues

[grafanabot]

./tools/diff_coverage.sh ../loki-main/test_results.txt test_results.txt ingester,distributor,querier,querier/queryrange,iter,storage,chunkenc,logql,loki

Change in test coverage per package. Green indicates 0 or positive change, red indicates that test coverage for a package fell.

+           ingester	0%
+        distributor	0%
+            querier	0%
+ querier/queryrange	0%
+               iter	0%
+            storage	0%
+           chunkenc	0%
+              logql	0%
+               loki	0%

[dannykopping]

LGTM, thanks!